Examkin

Conventions of Punctuation

374 questions

All types374Multiple choice326Fill in the blank48
Question 121Question →

The following passage is an excerpt from a biography of a famous scientist.

In 1962, biologist Rachel Carson published *Silent Spring*, a landmark book that warned of the dangers of chemical pesticides. The book, which initially faced fierce opposition from chemical companies, eventually inspired a nationwide ban on DDT. Her eloquent writing style helped launch the modern environmental movement.

Which of the following is the best choice for the underlined portion of the sentence?

Show answer & explanation

Answer: NO CHANGE

Answer

The correct option is the one that sets off the nonessential relative clause with a pair of commas, written as: 'book, which initially faced fierce opposition from chemical companies,'
The clause 'which initially faced fierce opposition from chemical companies' is nonessential (nonrestrictive) because the book has already been specifically identified as Rachel Carson's *Silent Spring*. Nonessential elements must be set off from the rest of the sentence with a pair of commas. The phrase 'book, which initially faced fierce opposition from chemical companies,' correctly places a comma before and after the nonessential clause.

Step-by-Step Solution

1
Identify the clause following the word 'book' as essential (restrictive) or nonessential (nonrestrictive).
The clause 'which initially faced fierce opposition from chemical companies' is nonessential because the specific book (*Silent Spring*) has already been named, so the clause merely adds extra information rather than identifying the book.
Determining whether a clause is essential or nonessential dictates the punctuation rules that must be applied.
2
Apply the correct punctuation rule for nonessential clauses.
Nonessential clauses must be set off from the rest of the sentence by a pair of commas (one before 'which' and one at the end of the clause after 'companies').
A parenthetical or nonessential element must be fully set off with matching punctuation on both sides to maintain sentence structure.
3
Evaluate the choices to find the one that correctly applies a pair of commas without introducing other punctuation errors.
The original phrasing 'book, which initially faced fierce opposition from chemical companies,' correctly uses a comma pair. Other options either omit the second comma, use a semicolon inappropriately, or incorrectly place commas around a 'that' clause.
This confirms that the original sentence requires no changes.

Key Concept

Nonessential elements (appositives, parenthetical adverbs, and nonrestrictive relative clauses) must be set off from the rest of the sentence by commas on both sides.
Question 122Question →

A single whale fall can support a complex ecological community for decades, in fact, researchers have identified distinct successional stages that host specialized species found nowhere else on the ocean floor.

Which choice best punctuates the underlined portion of the sentence?

Show answer & explanation

Answer: decades; in fact, researchers

Answer

decades; in fact, researchers
The correct option correctly uses a semicolon to separate two closely related independent clauses. The transitional phrase 'in fact' is correctly followed by a comma.

Step-by-Step Solution

1
Analyze the clauses on either side of the underline to determine if they are independent or dependent.
The first clause ('A single whale fall can support a complex ecological community for decades') is independent. The second clause ('in fact, researchers have identified distinct successional stages...') is also independent, containing both a subject ('researchers') and a verb ('have identified') to express a complete thought.
Correct punctuation depends on the structural relationship between the connected clauses.
2
Evaluate how transitional adverbs connect independent clauses.
Transitional adverbs like 'in fact' cannot connect independent clauses with only a comma, as this creates a comma splice. They must be preceded by a semicolon (or period) and followed by a comma.
A semicolon is needed to avoid a comma splice while maintaining the logical flow between the two closely related sentences.
3
Check the other options to ensure no fragments or incorrect dependent clauses are created.
Adding 'since' or 'which' introduces a subordinating element, turning the second clause into a dependent clause. Separating it with a semicolon then results in a fragment error.
Semicolons can only connect two independent clauses; they cannot connect an independent clause to a dependent clause.

Key Concept

Using a semicolon to link two independent clauses, particularly when the second clause begins with a transitional adverb or phrase.
Estimated Time:1m 0s
Question 123Question →

Read the passage below. What is the single punctuation mark that must fill the blank to correctly end the first sentence?

Fill in the blanks below

The chief engineer asked whether the new geothermal plant would be operational by the start of the winter season They wanted to ensure that the local grid could handle the increased demand without relying on fossil fuels.
Show answer & explanation

Answer

A period (.) is the correct punctuation mark to end the first sentence.
The correct punctuation is a period. The first sentence is a declarative statement containing an indirect question ('asked whether...'). Since it is not a direct question, a period is required to end the sentence, especially since the following word 'They' is capitalized and begins a new independent clause.

Step-by-Step Solution

1
Analyze the structure of the clause preceding the blank.
The clause 'The chief engineer asked whether the new geothermal plant would be operational by the start of the winter season' is an independent clause containing an indirect question ('whether...').
Identifying the clause structure determines if it can stand alone as a sentence and what punctuation it requires.
2
Determine if the clause is a direct question or a declarative statement.
Because it reports a question rather than asking one directly, it is a declarative statement (an indirect question) and does not take a question mark.
Indirect questions are grammatically declarative and must end with a period.
3
Identify the boundary before the next capitalized word.
The word 'They' is capitalized, indicating the start of a new independent sentence. Therefore, a terminal end-of-sentence punctuation mark is required to separate the two complete sentences.
Proper end-of-sentence punctuation prevents run-on sentences and comma splices.

Key Concept

Indirect questions are declarative sentences and must end with a period rather than a question mark.
Estimated Time:1m 0s
Question 124Question →

Although a honeybee colony contains thousands of workers, the hives' single queen spends it's life laying eggs to sustain the population.

Which of the following is the correct spelling and punctuation for the underlined portion of the sentence?

Show answer & explanation

Answer: hive's single queen spends its

Answer

hive's single queen spends its
The correct answer uses the singular possessive noun to show ownership of a single hive's queen, and the possessive pronoun to refer to the queen's life.

Step-by-Step Solution

1
Analyze the context to determine whether the noun showing ownership is singular or plural.
The sentence begins with the phrase 'a honeybee colony,' indicating a single colony and therefore a single hive. Thus, the singular possessive form is needed.
This distinguishes between the singular possessive and the plural possessive form of the noun.
2
Determine if the pronoun preceding 'life' requires an apostrophe.
The sentence requires a possessive pronoun to indicate ownership of the queen's life. The spelling without an apostrophe indicates possession, whereas the spelling with an apostrophe is a contraction meaning 'it is'.
This resolves the homophone confusion between contractions and possessive pronouns.
3
Combine the correct choices to identify the appropriate phrasing.
Combining the singular possessive noun and the possessive pronoun yields the correct phrasing.
This matches the grammatically correct elements to the corresponding option.

Key Concept

Distinguishing between singular and plural possessive nouns, and between possessive pronouns and contractions.
Question 125Question →

Although the museum curator initially cataloged the painting as a minor work from the Dutch Golden Age, subsequent chemical analysis of the pigments revealed a startling truth, the masterpiece was painted by Rembrandt himself.

Which choice best punctuates the underlined portion of the passage?

Show answer & explanation

Answer: truth: the masterpiece was

Answer

truth: the masterpiece was
The correct choice uses a colon to separate two independent clauses. The clause preceding the colon is a complete sentence, and the subsequent clause directly explains the 'startling truth' introduced in the first clause. This aligns perfectly with the standard rules for colon usage.

Step-by-Step Solution

1
Analyze the clause structure preceding the underlined portion.
The segment starting from 'Although...' and ending with 'truth' consists of an introductory dependent clause followed by a main independent clause, which can stand alone as a complete sentence.
This establishes that the preceding text is grammatically capable of supporting a colon.
2
Analyze the grammatical structure of the clause following the underlined portion.
'the masterpiece was painted by Rembrandt himself' contains a subject and a verb, expressing a complete thought that can stand alone as an independent clause.
This determines the relationship between the two clauses and the appropriate punctuation needed to link them.
3
Determine the correct punctuation to join these two clauses.
A colon is the correct punctuation mark here because it separates two independent clauses where the second clause explains or amplifies the first.
This allows for the elimination of options that introduce comma splices, fragments, or incomplete clauses before the colon.

Key Concept

A colon must be preceded by an independent clause (a complete thought) and can be used to join two independent clauses when the second clause directly explains, illustrates, or amplifies the first.
Estimated Time:1m 0s
Question 126Question →

While exploring deep-sea hydrothermal vents, astrobiologists identified several unstable, vibrant, complex, organic, compounds, and they hypothesized that these chemicals could support microbial life.

Which of the following choices best punctuates the underlined portion of the sentence?

Show answer & explanation

Answer: unstable, vibrant, complex organic compounds, and they

Answer

The choice that correctly punctuates the coordinate adjectives with commas, leaves the cumulative adjective and noun unseparated, and uses a comma before the coordinating conjunction to join the two independent clauses.
The correct choice properly separates the coordinate adjectives 'unstable', 'vibrant', and 'complex' with commas, while correctly omitting a comma before the cumulative adjective 'organic' and the noun 'compounds'. It also places a comma before the coordinating conjunction 'and' to separate the two independent clauses.

Step-by-Step Solution

1
Determine if the adjectives modifying the noun are coordinate or cumulative.
The adjectives 'unstable', 'vibrant', and 'complex' can be reordered and separated by 'and' without changing the meaning of the sentence, so they are coordinate adjectives and require commas between them. However, 'organic' is a cumulative adjective that functions as a single unit with the noun 'compounds' ('organic compounds'), so no comma should separate 'complex' from 'organic', nor should a comma separate 'organic' from 'compounds'.
Correctly applying adjective comma rules prevents punctuation errors in descriptive sequences.
2
Identify the clause boundary and determine the correct punctuation to link them.
The sentence consists of two independent clauses: the first ends with 'compounds' and the second begins with 'they hypothesized'. These clauses are connected by the coordinating conjunction 'and', which must be preceded by a comma.
Joining two independent clauses with a coordinating conjunction requires a comma before the conjunction to avoid comma splices or run-on sentences.
3
Combine the adjective punctuation and clause punctuation to evaluate the options.
The correct combination is 'unstable, vibrant, complex organic compounds, and they'.
This option properly formats both the coordinate/cumulative adjective sequence and the independent clause boundary.

Key Concept

Coordinate vs. Cumulative Adjectives and Clause Boundaries
Question 127Question →

Before the gala, the curator carefully arranged the fragile, ancient, manuscripts, and she polished the brass display cases, that would house the new exhibit.

Which choice represents the correct punctuation for the underlined portion of the sentence?

Show answer & explanation

Answer: fragile, ancient manuscripts, and she polished the brass display cases

Answer

The correct choice is the one that places a comma only between the coordinate adjectives 'fragile' and 'ancient' and uses a comma with a coordinating conjunction to link the independent clauses without any misplaced commas around the restrictive clause.
The correct choice uses a comma between the coordinate adjectives 'fragile' and 'ancient' to show they modify the noun 'manuscripts' equally, while correctly omitting a comma between the final adjective and the noun. It also uses a comma before the coordinating conjunction 'and' to properly separate two independent clauses, and avoids placing a comma before the restrictive relative clause starting with 'that'.

Step-by-Step Solution

1
Evaluate the relationship between the adjectives 'fragile' and 'ancient' modifying 'manuscripts'.
They are coordinate adjectives because they can be reversed ('ancient, fragile manuscripts') and can be joined with 'and' ('fragile and ancient manuscripts'). Thus, a comma must separate them, but no comma should separate 'ancient' from the noun 'manuscripts'.
To apply coordinate adjective punctuation rules correctly.
2
Determine the boundary between the two main clauses: 'the curator carefully arranged the fragile, ancient manuscripts' and 'she polished the brass display cases'.
Since both clauses are independent, they must be separated by either a semicolon or a comma combined with a coordinating conjunction like 'and'.
To avoid comma splices or run-on sentences.
3
Check the punctuation before the relative clause 'that would house the new exhibit'.
The relative clause is restrictive (essential to identify which display cases are meant), so it should not have a comma before it.
To follow standard punctuation rules for restrictive clauses.

Key Concept

Punctuation of coordinate adjectives, independent clauses, and restrictive clauses
Estimated Time:1m 0s
Question 128Question →

To become a certified master chef, candidates must master three distinct culinary techniques, which include: braising, poaching, and emulsifying.

Which option best replaces the underlined portion of the sentence?

Show answer & explanation

Answer: techniques: braising

Answer

techniques: braising
The correct option correctly uses a colon after the noun 'techniques'. Because the clause preceding the colon ('To become a certified master chef, candidates must master three distinct culinary techniques') is independent, the colon is grammatically permitted to introduce the list of three techniques ('braising, poaching, and emulsifying').

Step-by-Step Solution

1
Analyze the clause preceding the punctuation mark.
The clause 'To become a certified master chef, candidates must master three distinct culinary techniques' is a complete thought and can stand alone as an independent clause.
According to grammar rules, a colon must always be preceded by a complete independent clause.
2
Evaluate the relationship between the independent clause and the information that follows.
The words 'braising, poaching, and emulsifying' form a list of the specific techniques mentioned in the main clause.
A colon is the appropriate punctuation mark to introduce a list that clarifies or explains the preceding independent clause.
3
Eliminate options that violate punctuation rules.
The option containing 'which include:' is incorrect because it places a colon after a verb phrase. The option starting with 'techniques. Braising' creates a sentence fragment. The option with 'techniques, they are' creates a comma splice.
Only the option using a colon directly after the independent clause correctly and grammatically links the introduction and the list.

Key Concept

A colon must be preceded by an independent clause and is used to introduce a list, explanation, or definition.
Question 129Question →

In the late afternoon, thousands of starlings gather in the sky to perform complex aerial maneuvers known as murmurations. These synchronized flocks shape-shift fluidly without any single leader directing the group; each bird simply responds to the movements of its closest neighbors.

Which of the following alternatives to the underlined portion is grammatically correct?

Show answer & explanation

Answer: NO CHANGE

Answer

The original phrasing, which uses a semicolon to connect the two independent clauses, is correct.
The underlined portion correctly uses a semicolon to join two closely related independent clauses ('These synchronized flocks shape-shift fluidly without any single leader directing the group' and 'each bird simply responds to the movements of its closest neighbors') without a coordinating conjunction.

Step-by-Step Solution

1
Determine if the clauses before and after the underlined portion are independent or dependent.
Both 'These synchronized flocks shape-shift fluidly without any single leader directing the group' and 'each bird simply responds to the movements of its closest neighbors' can stand alone as complete sentences, meaning they are both independent clauses.
Identifying the clause types is necessary to choose the correct punctuation to join them.
2
Evaluate the grammar of each punctuation option for joining two independent clauses.
A semicolon alone is a valid way to join two independent clauses. A comma alone creates a comma splice. A semicolon followed by 'because' creates an incomplete dependent clause (fragment). A semicolon followed by 'and' is redundant and grammatically incorrect.
This process of elimination helps identify the correct grammatical structure.

Key Concept

Using a semicolon to connect two independent clauses without a coordinating conjunction.
Estimated Time:45s
Question 130Question →

To forecast the weather accurately, meteorologists rely on a variety of advanced instruments: barometers, anemometers, and hygrometers.

Which of the following options correctly punctuates the underlined portion of the sentence?

Show answer & explanation

Answer: NO CHANGE

Answer

The choice that reads 'NO CHANGE' is correct because the clause before the colon is independent and the colon properly introduces a list of weather instruments.
The choice that leaves the sentence unchanged is correct. The clause before the colon is a complete independent clause, and the colon is the standard punctuation mark used to introduce a list of examples.

Step-by-Step Solution

1
Identify the clause preceding the underlined portion and determine if it can stand alone as a complete sentence.
The clause 'To forecast the weather accurately, meteorologists rely on a variety of advanced instruments' contains a subject and verb and is independent.
A colon can only be used if it is preceded by a complete independent clause.
2
Analyze the function of the information following the punctuation.
The items 'barometers, anemometers, and hygrometers' function as a list of examples clarifying the 'instruments'.
A colon is appropriate to introduce a list, explanation, or elaboration.
3
Evaluate the incorrect options against the rules for semicolons, colons, and commas.
Semicolons require independent clauses on both sides; placing a colon after 'including' creates an incomplete sentence; a comma alone does not provide the correct grammatical transition for this list.
Eliminating grammatically incorrect choices helps identify the correct punctuation choice.

Key Concept

A colon must be preceded by a complete independent clause and can be used to introduce a list, explanation, or quote.
Question 131Question →

In the 1940s, geneticist Barbara McClintock studied the inheritance patterns of maize plants. Her research on transposons, which are DNA sequences that can move within a genome, eventually earned her a Nobel Prize in Physiology or Medicine. This groundbreaking work challenged the long-held belief that genes were static entities on chromosomes.

Which choice best punctuates the underlined portion of the sentence?

Show answer & explanation

Answer: on transposons, which are DNA sequences that can move within a genome,

Answer

on transposons, which are DNA sequences that can move within a genome,
The correct choice properly uses a comma before 'which' and a comma after 'genome' to enclose the nonessential relative clause 'which are DNA sequences that can move within a genome.' This clause provides descriptive details about 'transposons' but is not essential to the overall sentence structure.

Step-by-Step Solution

1
Identify the parenthetical or nonessential element in the sentence.
The phrase 'which are DNA sequences that can move within a genome' provides supplementary descriptive information about 'transposons.' The core sentence remains complete without it: 'Her research on transposons eventually earned her a Nobel Prize in Physiology or Medicine.'
Nonessential elements must be set off from the rest of the sentence by punctuation (typically commas).
2
Apply the appropriate punctuation rules for nonessential elements.
Since the nonessential element appears in the middle of the sentence, it must be enclosed by a pair of commas: one before 'which' and one after 'genome.'
Omitting one of the commas results in a dangling comma error, and using a semicolon instead of a comma incorrectly separates a dependent clause from its main clause.
3
Check the restrictive clause within the nonessential element.
The clause 'that can move within a genome' restricts 'DNA sequences' and should not be separated from it by a comma.
Restrictive clauses are essential to the meaning and must not be separated from their referent with commas.

Key Concept

Commas with Nonessential and Parenthetical Elements
Estimated Time:1m 0s
Question 132Question →

Although the two separate engineering teams worked diligently on the locomotive, the crews' primary concern was it's electrical system.

Which choice is the correct spelling and punctuation of the underlined portion of the sentence?

Show answer & explanation

Answer: crews' primary concern was its

Answer

crews' primary concern was its
The correct answer is 'crews' primary concern was its'. Since the sentence specifies that there are 'two separate engineering teams,' the plural possessive noun 'crews'' is required to show ownership of the 'concern.' In addition, the pronoun refers to the singular noun 'locomotive,' which requires the possessive pronoun 'its' rather than the contraction 'it's' (which means 'it is').

Step-by-Step Solution

1
Determine if the noun referring to the engineering teams should be singular or plural, and if it requires possessive punctuation.
The sentence references 'two separate engineering teams,' which indicates multiple groups. Therefore, the plural noun 'crews' is needed. Because the 'concern' belongs to these crews, the noun must be possessive. The correct plural possessive spelling is 'crews''.
For plural nouns ending in 's,' the possessive is formed by adding an apostrophe after the final 's.'
2
Determine whether the possessive pronoun 'its' or the contraction 'it's' is appropriate to refer to the locomotive's system.
The pronoun modifies 'electrical system' and refers back to the singular locomotive. A possessive pronoun is required here. The spelling 'its' represents the possessive pronoun, whereas 'it's' is a contraction for 'it is.'
Possessive pronouns do not use apostrophes, while apostrophes in pronouns indicate contractions.
3
Combine the findings to select the correct choice.
The option containing the plural possessive noun 'crews'' and the possessive pronoun 'its' is the only grammatically correct combination.
It matches the plural antecedent of the teams and avoids the contraction error.

Key Concept

Apostrophes are used to show possession for nouns (adding 's for singular nouns and an apostrophe after the s for plural nouns ending in s) but are never used for possessive pronouns like 'its' (which is the possessive form, while 'it's' is a contraction for 'it is').
Question 133Question →

The following passage contains an underlined portion.

In 1952, British biophysicist Rosalind Franklin captured a groundbreaking X-ray diffraction image of DNA. This photograph, which was known as Photo 51, showed a pattern that was crucial to Watson and Crick’s discovery of the double helix. Today, Franklin is widely recognized for her critical contributions to molecular biology.

Which of the following choices represents the correct punctuation for the underlined portion of the passage?

Show answer & explanation

Answer: NO CHANGE

Answer

The correct answer is the option that keeps the original punctuation, which correctly uses a pair of commas to set off the nonessential clause and leaves the restrictive clause unpunctuated.
The correct option correctly identifies 'which was known as Photo 51' as a nonessential clause and sets it off with a pair of commas. It also correctly recognizes 'that was crucial' as a restrictive clause and leaves it unpunctuated, maintaining the connection to its noun referent.

Step-by-Step Solution

1
Identify nonessential (parenthetical) and essential (restrictive) elements in the sentence.
The clause 'which was known as Photo 51' is nonessential because removing it does not change the core meaning of the sentence. The clause 'that was crucial' is restrictive because it defines which specific pattern is being discussed.
Nonessential elements must be set off by commas, while restrictive elements must not be set off by commas.
2
Evaluate the punctuation around the nonessential element.
A pair of commas must enclose 'which was known as Photo 51', placing one comma after 'photograph' and another after 'Photo 51'.
Omitting either comma leaves a dangling punctuation mark and disrupts the grammatical structure.
3
Evaluate the punctuation around the restrictive element.
No commas should separate the noun 'pattern' from the relative clause 'that was crucial'.
Adding commas around a restrictive clause incorrectly isolates essential identifying information.

Key Concept

Commas with Nonessential and Parenthetical Elements
Estimated Time:1m 0s
Question 134Question →

Identify the correct punctuation mark that completes the sentence boundary in the passage. What punctuation mark must be inserted into the blank to properly end the first sentence?

Fill in the blanks below

Although the telescope was originally designed to observe planets, the astronomer wondered if it could also be used to detect distant nebulae She adjusted the focal lens to begin her search.
Show answer & explanation

Answer

A period (.) is the correct punctuation mark because the first sentence contains an indirect question, which functions as a statement and must end with a period rather than a question mark.
The correct answer is a period. The first sentence is a statement containing an indirect question ('the astronomer wondered if it could also be used to detect distant nebulae'). Indirect questions function as declarative statements and must end with a period rather than a question mark.

Step-by-Step Solution

1
Analyze the structure of the first sentence to determine if it is a direct question or an indirect question.
The clause 'the astronomer wondered if it could also be used to detect distant nebulae' is phrased as a statement reporting what the astronomer wondered (an indirect question), not a direct inquiry.
Indirect questions do not ask a question directly and are grammatically structured as declarative statements.
2
Select the appropriate end-of-sentence punctuation mark based on the sentence type.
Since declarative statements and indirect questions require a period to end the sentence, a period must be used.
Using a question mark would be incorrect for an indirect question, and omitting punctuation or using a comma would create a run-on or comma splice.

Key Concept

Distinguishing between direct and indirect questions to apply correct end-of-sentence punctuation.
Estimated Time:45s
Question 135Question →

Determine which single punctuation mark should replace the blank to correctly join the independent clauses in the sentence below.

Fill in the blanks below

Physarum polycephalum, a single-celled slime mold, does not possess a brain or nervous system nevertheless, it can navigate complex mazes to find the shortest path to a food source.
Show answer & explanation

Answer

A semicolon (;)
A semicolon is correct because it is the proper punctuation mark to link two independent clauses, especially when the second clause begins with a conjunctive adverb like 'nevertheless'. Because 'nevertheless' is in lowercase, a period cannot be used without capitalizing the next word, making the semicolon the only grammatically acceptable option.

Step-by-Step Solution

1
Analyze the grammatical structure of the clauses on both sides of the blank.
The clause before the blank ('Physarum polycephalum, a single-celled slime mold, does not possess a brain or nervous system') is an independent clause. The clause after the blank ('nevertheless, it can navigate complex mazes to find the shortest path to a food source') is also an independent clause starting with a conjunctive adverb.
Identifying the clause type helps determine the punctuation marks that are grammatically permissible to connect them.
2
Examine the capitalization of the word following the blank and assess potential punctuation choices.
The word 'nevertheless' starts with a lowercase letter, ruling out a period. A comma is also ruled out because joining two independent clauses with a comma alone results in a comma splice.
This eliminates punctuation marks that would violate sentence structure rules or require capitalization adjustments.
3
Select the correct punctuation mark that joins independent clauses separated by a conjunctive adverb.
A semicolon is the correct punctuation mark because it is designed to link two independent clauses, particularly when the second begins with a conjunctive adverb.
This ensures the sentence is grammatically correct and coherent without introducing structural errors.

Key Concept

Using a semicolon to link closely related independent clauses joined by a conjunctive adverb.
Estimated Time:1m 0s
Question 136Question →

In 1967, astrophysicist Jocelyn Bell Burnell observed a series of regular radio pulses that she initially nicknamed 'Little Green Men'; however, further analysis revealed the source to be a rapidly spinning neutron star, it is a pulsar, which emits electromagnetic radiation along its magnetic poles.

Which of the following is the correct punctuation and phrasing for the underlined portion of the sentence?

Show answer & explanation

Answer: star: a pulsar, which emits

Answer

The correct option is the phrasing that reads 'star: a pulsar, which emits', as it uses a colon after a complete independent clause to introduce a clarifying definition.
The phrasing that uses a colon to introduce the appositive phrase defining the neutron star is correct. The clause before the colon is fully independent, and the information after it serves to clarify the specific type of star, which is the proper function of a colon.

Step-by-Step Solution

1
Determine if the clause before the underlined portion is independent.
The clause 'In 1967, astrophysicist Jocelyn Bell Burnell observed a series of regular radio pulses that she initially nicknamed 'Little Green Men'; however, further analysis revealed the source to be a rapidly spinning neutron star' is a complete thought that can stand alone as a sentence.
According to punctuation rules, a colon must be preceded by a complete independent clause.
2
Evaluate the grammatical relationship of the information following the punctuation.
The phrase 'a pulsar, which emits electromagnetic radiation along its magnetic poles' acts as an appositive that clarifies and defines the 'neutron star'.
A colon is used to introduce an explanation, definition, or list that elaborates on the preceding independent clause.
3
Analyze and eliminate incorrect distractors based on punctuation errors.
The original phrasing creates a comma splice; placing a colon after 'was' creates an incomplete clause before the colon; separating the relative clause with a period creates a sentence fragment.
Eliminating these errors leaves only the correct use of the colon to connect the independent clause to its clarifying appositive.

Key Concept

A colon must be preceded by an independent clause and is used to introduce an explanation, definition, illustration, or list that clarifies the preceding clause.
Estimated Time:45s
Question 137Question →

During the Northern Renaissance, painters revolutionized the medium of panel painting by experimenting with new binders. Artists who adopted oil-based pigments, which dried much slower than traditional egg tempera achieved unprecedented levels of detail and luminosity. This technical shift allowed for the realistic depiction of light and texture that defined the era.

Which of the following options correctly punctuates the underlined portion of the sentence?

Show answer & explanation

Answer: who adopted oil-based pigments, which dried much slower than traditional egg tempera,

Answer

The correct choice is the option that correctly leaves the essential clause 'who adopted oil-based pigments' integrated without commas and encloses the nonessential clause 'which dried much slower than traditional egg tempera' with a pair of commas.
The clause 'who adopted oil-based pigments' is restrictive (essential) because it defines which specific artists achieved unprecedented detail and luminosity; therefore, it should not be set off by commas. In contrast, the clause 'which dried much slower than traditional egg tempera' is nonrestrictive (nonessential) because it adds extra descriptive information about the pigments, so it must be enclosed by a pair of commas. The correct option correctly leaves 'who adopted oil-based pigments' integrated into the main sentence while enclosing 'which dried much slower than traditional egg tempera' with commas on both sides.

Step-by-Step Solution

1
Analyze the structure of the sentence containing the underlined portion and identify the relative clauses.
The sentence contains two relative clauses modifying nouns: 'who adopted oil-based pigments' modifying 'Artists', and 'which dried much slower than traditional egg tempera' modifying 'pigments'.
Identifying the relative clauses allows us to determine their syntactic role and necessary punctuation.
2
Determine whether the first relative clause is essential (restrictive) or nonessential (nonrestrictive) to the meaning of the sentence.
The clause 'who adopted oil-based pigments' is essential because it specifies which particular group of artists achieved the unprecedented levels of detail and luminosity. Therefore, it should not be set off by commas.
Essential clauses define the nouns they modify and must not be separated from them by punctuation.
3
Determine whether the second relative clause is essential or nonessential.
The clause 'which dried much slower than traditional egg tempera' is nonessential because it merely adds extra descriptive information about oil-based pigments and does not change the core identity of the pigments. Thus, it must be enclosed within a parenthetical pair of commas.
Nonessential elements must be set off by commas on both sides to show they can be removed without altering the primary meaning of the sentence.
4
Select the option that reflects these punctuation rules.
The option that leaves the first clause integrated without commas and places a closing comma after 'tempera' is correct.
This configuration correctly balances the restrictive and nonrestrictive elements of the sentence.

Key Concept

Distinguishing between essential (restrictive) and nonessential (nonrestrictive) clauses, and applying proper comma punctuation to set off nonessential parenthetical elements.
Estimated Time:45s
Question 138Question →

Although the paleontologist had expected to find only common bivalve fossils in the limestone stratum, she instead uncovered a well-preserved, complete, skeleton of an ancient marine reptile, which she spent the next week carefully excavating.

Which of the following choices best punctuates the underlined portion of the sentence?

Show answer & explanation

Answer: well-preserved, complete skeleton of an ancient marine reptile, which she

Answer

The correct option is the one that separates the coordinate adjectives with a comma, has no comma before the noun, and uses a comma to introduce the dependent relative clause.
The correct option properly punctuates the sentence by placing a comma between the coordinate adjectives 'well-preserved' and 'complete' to show they independently modify the noun 'skeleton'. It correctly removes the erroneous comma before 'skeleton' and uses a comma to set off the non-essential relative clause starting with 'which'.

Step-by-Step Solution

1
Analyze the coordinate adjectives modifying the noun 'skeleton'.
The adjectives 'well-preserved' and 'complete' are coordinate because they can be reversed ('complete, well-preserved skeleton') and can be joined by 'and' ('well-preserved and complete skeleton'). Therefore, they must be separated by a comma, but no comma should be placed between the final adjective 'complete' and the noun 'skeleton'.
To ensure proper punctuation rules for coordinate adjectives are applied.
2
Determine the relationship between the main clause and the relative clause.
The clause beginning with 'which' is a non-essential relative clause that adds descriptive info about the skeleton. It must be separated from the main clause by a comma, not a semicolon or no punctuation.
To determine the correct punctuation at the clause boundary.
3
Evaluate the choices to find the one that meets all grammatical requirements.
The choice containing 'well-preserved, complete skeleton... which she' is the only option that correctly applies both coordinate adjective punctuation and non-essential clause punctuation without introducing comma splices or fragments.
To select the grammatically correct option.

Key Concept

Commas with Coordinate Adjectives and Non-essential Relative Clauses
Question 139Question →

To prepare the spacecraft for its historic voyage, engineers conducted a series of tests on the complex, advanced navigation systems, and they verified that every sensor was calibrated to withstand extreme solar radiation.

Which of the following options is the best choice for the underlined portion of the sentence?

Show answer & explanation

Answer: NO CHANGE

Answer

The correct choice is the one that retains the original punctuation, separating the coordinate adjectives with a comma and using a comma and coordinating conjunction to link the two independent clauses.
The correct choice keeps the comma between 'complex' and 'advanced' because they are coordinate adjectives. It does not place a comma before 'navigation' because 'navigation' is a cumulative adjective. Finally, it uses a comma before the coordinating conjunction 'and' because 'they verified...' begins a new independent clause.

Step-by-Step Solution

1
Identify whether the adjectives 'complex' and 'advanced' are coordinate or cumulative.
They are coordinate adjectives because they can be reversed ('advanced, complex') and joined with 'and' ('complex and advanced') while retaining the same meaning.
Coordinate adjectives must be separated by a comma.
2
Determine if a comma is needed between 'advanced' and 'navigation'.
No comma is needed because 'navigation' is a cumulative adjective modifying 'systems' rather than a coordinate adjective.
Cumulative adjectives should not be separated by commas.
3
Evaluate the clause boundary after 'systems'.
'Engineers conducted a series of tests...' and 'they verified...' are two independent clauses.
Two independent clauses must be joined by a comma and a coordinating conjunction (such as 'and') or by a semicolon alone.

Key Concept

Commas with coordinate adjectives and independent clauses
Estimated Time:1m 0s
Question 140Question →

Deep within the dense canopy of the Guatemalan jungle, archaeologists have long struggled to locate ancient Maya structures. Recently, however, light detection and ranging (LiDAR) technology has revolutionized the field, researchers fire millions of laser pulses from an airplane to map the ground beneath the foliage. This method has revealed thousands of previously hidden ruins, including pyramids, highways, and defensive walls.

Which of the following choices best punctuates the underlined portion of the passage?

Show answer & explanation

Answer: field; researchers fire

Answer

field; researchers fire
The semicolon is used to separate two independent clauses that are closely related. The clause before the punctuation ('Recently, however, light detection and ranging (LiDAR) technology has revolutionized the field') and the clause after ('researchers fire millions of laser pulses...') are both independent because they each contain a subject and a verb and express a complete thought. The option 'field; researchers fire' correctly joins these two independent clauses without introducing grammatical errors.

Step-by-Step Solution

1
Analyze the clause before the underline.
The clause 'Recently, however, light detection and ranging (LiDAR) technology has revolutionized the field' is independent because it contains a subject (technology) and a verb (has revolutionized) and expresses a complete thought.
Identifying clause types is necessary to determine proper punctuation at sentence boundaries.
2
Analyze the clause after the underline.
The clause 'researchers fire millions of laser pulses from an airplane to map the ground beneath the foliage' is also independent because it has a subject (researchers) and a verb (fire) and can stand alone as a sentence.
This determines whether the punctuation must separate two independent clauses.
3
Evaluate the punctuation and grammatical structure of the options.
Joining two independent clauses requires a semicolon, a period, or a comma with a coordinating conjunction. The option 'field; researchers fire' correctly uses a semicolon and maintains the conjugated verb 'fire'.
This eliminates options that create comma splices, fragments, or incorrect semicolon usage.

Key Concept

End-of-Sentence Punctuation
Estimated Time:1m 0s
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