Examkin

Conventions of Punctuation

374 questions

All types374Multiple choice326Fill in the blank48
Question 181Question →

Type the punctuation mark that belongs in the blank to join the two independent clauses.

Fill in the blanks below

Many modern architects prefer to use reclaimed timber for structural support this material offers exceptional durability while reducing the carbon footprint of new construction.
Show answer & explanation

Answer

A semicolon (;) is the correct punctuation mark to join the two independent clauses.
A semicolon is the correct punctuation mark because it is used to connect two closely related independent clauses without a coordinating conjunction. In the given sentence, the clauses on both sides of the blank are independent, meaning they contain a subject and a verb and express a complete thought.

Step-by-Step Solution

1
Analyze the grammatical structure of the clauses on either side of the blank.
The clause before the blank ('Many modern architects prefer to use reclaimed timber for structural support') is an independent clause. The clause after the blank ('this material offers exceptional durability while reducing the carbon footprint of new construction') is also an independent clause.
Identifying clause types is necessary to determine which punctuation rules apply.
2
Determine the appropriate punctuation to join two independent clauses without a coordinating conjunction.
A semicolon is the standard punctuation mark used to link two closely related independent clauses when no coordinating conjunction (like 'and', 'but', or 'so') is present.
Using a comma alone would result in a comma splice, and omitting punctuation entirely would result in a run-on sentence.

Key Concept

Semicolons
Question 182Question →

Botanists were shocked in 1994 when they discovered a small grove of Wollemi pines in a remote Australian canyon. The prehistoric trees, which were previously thought to have been extinct for millions of years, survived in deep sandstone gorges. Conservationists immediately began a propagation program to safeguard the species.

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

Show answer & explanation

Answer: NO CHANGE

Answer

NO CHANGE
The correct choice is the option that keeps the original punctuation. The clause describing the history of the Wollemi pines is nonessential to the core meaning of the sentence, so it must be enclosed by a pair of commas: one after 'trees' and one after 'years'. This correctly links the subject 'trees' to its verb 'survived'.

Step-by-Step Solution

1
Determine if the underlined clause is essential or nonessential to the sentence.
The clause 'which were previously thought to have been extinct for millions of years' is nonessential because removing it does not change the core meaning of the main clause ('The prehistoric trees survived in deep sandstone gorges').
Nonessential elements must be set off from the rest of the sentence by punctuation on both sides.
2
Verify the correct punctuation to set off the nonessential relative clause.
A pair of commas is required: one starting the clause after 'trees' and one closing it after 'years'.
This properly encloses the parenthetical description, leaving the main subject and verb connected.

Key Concept

Commas with Nonessential and Parenthetical Elements
Estimated Time:45s
Question 183Question →

The following passage is an excerpt from a history of Mayan archaeology.

For decades, Mayan scholars believed that the hieroglyphs carved into stone stelae recorded only mythical stories and astronomical tables. In 1960, Tatiana Proskouriakoff published a breakthrough study of the glyphs at Piedras Negras. She demonstrated that the monument inscriptions, which were carved at regular intervals of five hotuns, actually detailed the births, accessions, and victories of historical rulers.

Which choice best punctuates the underlined portion of the sentence?

Show answer & explanation

Answer: NO CHANGE

Answer

The correct choice is the one that sets off the nonessential relative clause with a pair of commas, using 'which' and placing commas both after 'inscriptions' and after 'hotuns'.
The correct choice successfully identifies the clause as nonessential and uses a matching pair of commas to set it off. The relative pronoun 'which' is appropriate for nonrestrictive clauses, and commas are placed correctly after 'inscriptions' and after 'hotuns'.

Step-by-Step Solution

1
Identify the grammatical role of the relative clause starting with 'which'.
The clause 'which were carved at regular intervals of five hotuns' is nonessential (nonrestrictive) because the noun phrase 'the monument inscriptions' is already specific, meaning the clause adds extra details rather than identifying which inscriptions are meant.
Determining whether a clause is essential or nonessential dictates the type of punctuation required.
2
Select the correct punctuation pattern for nonessential elements.
Nonessential elements must be set off from the rest of the sentence by a matching pair of punctuation marks, such as commas.
Setting off parenthetical information at both ends ensures clear sentence structure and flow.
3
Evaluate the choices to find the one that correctly implements a pair of commas and uses the appropriate relative pronoun.
The original phrasing correctly starts the nonessential clause with 'which' and surrounds it with commas. The option omitting the second comma, the option putting commas around 'that', and the option using a semicolon are incorrect.
Only one option adheres to all rules of punctuation and relative pronoun usage.

Key Concept

Commas with Nonessential and Parenthetical Elements
Question 184Question →

The following passage is an excerpt from a biography of a historic figure.

When the chief engineer of the Brooklyn Bridge fell ill in 1872, his wife Emily Warren Roebling stepped in to manage the daily operations of the monumental project. The engineers who drafted the daily blueprints, which were critical to the project, met with Emily Roebling every morning to receive instructions. Ultimately, her dedication ensured the successful completion of what was then the longest suspension bridge in the world.

Which of the following is the most effective punctuation for the underlined portion of the passage?

Show answer & explanation

Answer: NO CHANGE

Answer

The correct option is the original phrasing, which leaves the restrictive clause unpunctuated and encloses the nonessential relative clause in a pair of commas.
The correct choice keeps the restrictive relative clause 'who drafted the daily blueprints' unpunctuated, as it is essential to identifying which specific engineers are being discussed. Additionally, it correctly sets off the nonessential relative clause 'which were critical to the project' with commas on both sides, separating it from the main flow of the sentence.

Step-by-Step Solution

1
Analyze the underlined portion to identify the clauses and determine their essentiality.
The clause 'who drafted the daily blueprints' is essential (restrictive) because it specifies which engineers met with Emily Roebling. The clause 'which were critical to the project' is nonessential (nonrestrictive) because it simply adds descriptive details about the blueprints.
Essential clauses should not be separated by commas, while nonessential clauses must be enclosed in commas.
2
Evaluate the punctuation rules for both clauses to determine the correct punctuation layout.
No commas should precede 'who', but commas must enclose 'which were critical to the project', leading to a comma before 'which' and a comma after 'project'.
This maintains the grammatical structure of the sentence without causing fragments or separating modifiers from their nouns.

Key Concept

Commas with Nonessential and Parenthetical Elements
Question 185Question →

The following passage is an excerpt from an essay on the history of science.

In the mid-twentieth century, the scientific community remained skeptical of plate tectonics. Marie Tharp, a pioneering cartographer, created the ocean map that proved the theory of continental drift. Her meticulous work revealed the dramatic topography of the ocean floor, transforming geology forever.

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

Show answer & explanation

Answer: NO CHANGE

Answer

NO CHANGE
The correct choice properly uses a pair of commas to set off the nonessential appositive 'a pioneering cartographer' while leaving the restrictive relative clause 'that proved the theory of continental drift' unpunctuated.

Step-by-Step Solution

1
Identify nonessential elements in the sentence.
The phrase 'a pioneering cartographer' is an appositive describing Marie Tharp. Since removing it does not change the core meaning of the sentence, it is nonessential and must be enclosed by a pair of commas.
Nonessential appositives require punctuation on both sides to set them apart from the rest of the sentence.
2
Identify restrictive elements in the sentence.
The relative clause 'that proved the theory of continental drift' is restrictive because it defines exactly which ocean map is being referred to. It should not be set off by commas.
Restrictive clauses are essential to the meaning of the sentence and must not be separated from their referent.
3
Evaluate the option choices against these rules.
Only the original phrasing ('NO CHANGE') correctly uses a pair of commas for the appositive and leaves the restrictive clause unpunctuated.
This maintains correct grammatical structure and sentence clarity.

Key Concept

Commas with Nonessential and Parenthetical Elements
Estimated Time:1m 0s
Question 186Question →

To successfully harvest natural vanilla, farmers must execute a tedious task, they must hand-pollinate each orchid blossom during a narrow morning window.

Which choice most effectively punctuates the underlined portion of the sentence?

Show answer & explanation

Answer: task: they must hand-pollinate

Answer

The option using a colon to introduce the explanation of the task is the correct choice.
The correct option uses a colon to separate two independent clauses. The clause preceding the colon is independent and can stand alone as a complete sentence, and the clause following the colon directly explains and defines the 'tedious task' mentioned in the first clause.

Step-by-Step Solution

1
Analyze the grammatical structure of the clause preceding the punctuation.
The clause 'To successfully harvest natural vanilla, farmers must execute a tedious task' is an independent clause because it contains a subject and a verb and can stand alone as a complete sentence.
A colon must always be preceded by a complete independent clause.
2
Analyze the relationship between the first clause and the following clause.
The clause 'they must hand-pollinate each orchid blossom during a narrow morning window' is also independent and directly explains or defines the 'tedious task' mentioned in the first clause.
A colon is appropriate for joining two independent clauses when the second clause explains, illustrates, or expands on the first.
3
Evaluate the incorrect options to identify their grammatical errors.
Using a comma alone creates a comma splice. A colon placed after 'requires' follows a verb rather than a complete clause. A comma before 'that' improperly sets off a restrictive clause.
Eliminating grammatically incorrect options confirms the correct punctuation choice.

Key Concept

Using colons to connect independent clauses or introduce explanations
Estimated Time:1m 0s
Question 187Question →

To determine the age of the ancient timber, the dendrochronologists extracted several thin cylindrical, core samples, and they examined the growth rings under a high-powered microscope.

Which choice best punctuates the underlined portion of the sentence?

Show answer & explanation

Answer: thin, cylindrical core samples, and they examined

Answer

The correct choice is the one that punctuates the coordinate adjectives with a comma ('thin, cylindrical'), keeps the cumulative adjective and noun modifier unpunctuated ('core samples'), and uses a comma before the coordinating conjunction 'and' to connect the two independent clauses.
The correct choice properly applies the rules of punctuation for coordinate adjectives and independent clauses. The adjectives 'thin' and 'cylindrical' are coordinate because they can be reversed and joined by 'and' while maintaining a natural sound; therefore, a comma must separate them. The word 'core' acts as a noun adjunct modifying 'samples,' making 'cylindrical' and 'core' cumulative adjectives, which should not be separated by a comma. Finally, the sentence contains two independent clauses joined by the coordinating conjunction 'and,' which requires a comma beforehand to avoid a run-on sentence.

Step-by-Step Solution

1
Analyze the relationship between the adjectives modifying the noun phrase 'core samples'.
The adjectives 'thin' and 'cylindrical' are coordinate adjectives because they can be reversed ('cylindrical, thin') and connected by 'and' ('thin and cylindrical') naturally. Therefore, they require a comma between them. However, 'core' acts as a noun adjunct modifying 'samples,' making 'cylindrical' and 'core' cumulative adjectives, which should not have a comma between them.
To determine the correct punctuation between modifiers and the noun.
2
Identify the clause structure of the entire sentence to determine the correct conjunction and punctuation.
The sentence consists of two independent clauses: 'the dendrochronologists extracted several thin, cylindrical core samples' and 'they examined the growth rings...'. These two complete thoughts are joined by the coordinating conjunction 'and,' which requires a comma before it.
To ensure correct connection of independent clauses and avoid run-on sentences or comma splices.
3
Evaluate the remaining options against the rules identified in Steps 1 and 2.
The correct choice must read: 'thin, cylindrical core samples, and they examined'. The other options fail by omitting the required comma between coordinate adjectives, separating the adjective from its noun, creating a comma splice, or creating a sentence fragment with an incorrect semicolon.
To select the grammatically correct option that fits all rules.

Key Concept

Commas with Lists, Clauses, and Coordinate Adjectives
Estimated Time:1m 0s
Question 188Question →

Many plant species rely on mutualistic relationships with fungi to absorb nutrients from the soil. The ghost orchid, which lacks leaves and chlorophyll, depends entirely on mycorrhizal fungi for survival. Without this symbiotic partner, the orchid seeds would fail to germinate.

Which choice best punctuates the underlined portion of the sentence?

Show answer & explanation

Answer: NO CHANGE

Answer

The correct choice is the original phrasing, which correctly uses a pair of commas to set off the nonessential relative clause.
The relative clause 'which lacks leaves and chlorophyll' provides nonessential descriptive details about the ghost orchid. Since the noun phrase 'the ghost orchid' already uniquely specifies the subject, the relative clause is nonessential and must be enclosed by a pair of commas. The original phrasing correctly starts the clause with a comma after 'orchid' and closes it with a comma after 'chlorophyll'.

Step-by-Step Solution

1
Determine if the underlined clause is essential (restrictive) or nonessential (nonrestrictive) to the meaning of the sentence.
The clause 'which lacks leaves and chlorophyll' is nonessential because 'ghost orchid' is a specific species name that already identifies the subject.
Nonessential information must be set off from the main clause using punctuation (commas, dashes, or parentheses), whereas essential information receives no punctuation.
2
Select the correct punctuation pattern to enclose the nonessential clause.
A pair of commas must surround the clause, with one comma immediately before 'which' and another immediately after 'chlorophyll'.
Omitting one of the commas or using a semicolon incorrectly interrupts the grammatical structure of the sentence.

Key Concept

Setting off nonessential relative clauses with a pair of commas
Estimated Time:1m 0s
Question 189Question →

To prepare for the upcoming gallery exhibition, the curator carefully inspected the delicate, ancient, oil paintings, organized the display cases, and finalized the guest list.

Which of the following options represents the correct punctuation for the underlined portion of the sentence?

Show answer & explanation

Answer: delicate, ancient oil paintings, organized

Answer

delicate, ancient oil paintings, organized
The correct option is 'delicate, ancient oil paintings, organized.' In this version, 'delicate' and 'ancient' are properly recognized as coordinate adjectives modifying 'oil paintings,' which requires a comma between them. 'Oil' is correctly identified as a cumulative adjective that should not be separated from 'ancient' by a comma. Furthermore, the comma after 'paintings' is correctly placed to separate the first action ('inspected') from the second action ('organized') in the three-part compound predicate.

Step-by-Step Solution

1
Determine if 'delicate,' 'ancient,' and 'oil' are coordinate or cumulative adjectives modifying 'paintings.'
'Delicate' and 'ancient' are coordinate because they can be reversed ('ancient, delicate') or joined by 'and.' 'Oil' is cumulative because it directly defines the type of painting and cannot be separated or reordered.
Coordinate adjectives require a separating comma, while cumulative adjectives do not.
2
Analyze the list structure in the sentence.
The sentence presents a list of three parallel actions: 'carefully inspected...,' 'organized...,' and 'finalized...'
Items in a three-element list must be separated by commas.
3
Combine the rules to select the correct punctuation.
The correct phrase must be 'delicate, ancient oil paintings, organized.'
This correctly places a comma between coordinate adjectives and after the first list item.

Key Concept

Distinguishing between coordinate and cumulative adjectives and applying correct comma placement in a list of parallel predicates.
Estimated Time:1m 0s
Question 190Question →

In the mid-twentieth century, computer scientist Grace Hopper developed a compiler that translated English-like instructions into machine code, this innovation paved the way for modern programming languages.

Which of the following is the most appropriate punctuation for the underlined portion of the sentence?

Show answer & explanation

Answer: code: this innovation paved

Answer

The correct answer is the option that uses a colon to connect the two independent clauses, reading 'code: this innovation paved'.
The correct option correctly uses a colon to separate two independent clauses. The clause preceding the colon, which describes Hopper developing a compiler, can stand alone as a complete sentence. The clause following the colon, which explains that the innovation paved the way for programming languages, directly elaborates on the first. Under standard grammar rules, a colon can connect two independent clauses when the second explains or amplifies the first.

Step-by-Step Solution

1
Analyze the grammatical structure of the clause preceding the punctuation mark.
The clause 'In the mid-twentieth century, computer scientist Grace Hopper developed a compiler that translated English-like instructions into machine code' is independent because it contains a subject and a verb and expresses a complete thought.
A colon can only be used if it is preceded by a complete independent clause.
2
Evaluate the relationship between the first clause and the second clause.
The second clause 'this innovation paved the way for modern programming languages' is also independent and directly explains or amplifies the significance of the first clause.
A colon is appropriate here because it introduces an explanation or elaboration of the preceding independent clause.
3
Identify and eliminate options that violate punctuation rules.
The comma splice, the colon after a subordinating conjunction, and the comma before a restrictive relative clause are all incorrect grammatical structures.
Eliminating these distractors leaves only the correct option with proper colon usage.

Key Concept

Using colons to connect independent clauses where the second explains or amplifies the first.
Estimated Time:1m 0s
Question 191Question →

After the library acquired the rare medieval manuscript, several local scholars' primary concern was it's fragile binding, which required immediate conservation.

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

Show answer & explanation

Answer: scholars' primary concern was its

Answer

The correct answer uses the plural possessive noun 'scholars'' followed by the singular possessive pronoun 'its' without an apostrophe.
The correct option correctly applies standard punctuation rules: 'scholars'' is the plural possessive form matching the plural context 'several,' and 'its' is the correct possessive pronoun modifying 'fragile binding.'

Step-by-Step Solution

1
Determine if the noun 'scholars' should be singular or plural, and possessive.
The word 'several' indicates that the noun is plural ('scholars'). Since the concern belongs to these scholars, the plural possessive form 'scholars'' is required.
Plural nouns ending in 's' form the possessive by adding an apostrophe after the 's'.
2
Determine whether to use a contraction or a possessive pronoun for the manuscript's binding.
The sentence requires the possessive pronoun 'its' to modify 'fragile binding.' The contraction 'it's' (it is) is incorrect in this context.
Possessive pronouns do not take apostrophes, whereas 'it's' is a contraction.

Key Concept

Apostrophes for Possessives and Contractions
Question 192Question →

To bake authentic sourdough bread, a chef needs only two basic ingredients: flour and water.

Which choice best punctuates the underlined portion of the sentence?

Show answer & explanation

Answer: ingredients: flour

Answer

ingredients: flour
The correct option correctly uses a colon after the independent clause 'To bake authentic sourdough bread, a chef needs only two basic ingredients' to introduce the list of ingredients ('flour and water').

Step-by-Step Solution

1
Analyze the clause preceding the punctuation mark.
The clause 'To bake authentic sourdough bread, a chef needs only two basic ingredients' is an independent clause because it can stand alone as a complete sentence.
A colon must be preceded by an independent clause.
2
Analyze the phrase following the punctuation mark.
The phrase 'flour and water' is a list of items clarifying the preceding clause, not a complete sentence.
A colon can be used to introduce a list or explanation that follows an independent clause.
3
Evaluate the punctuation options based on grammatical rules.
The option with the colon is correct because it appropriately introduces the list. The semicolon option is incorrect because a semicolon must separate two independent clauses. The option placing a colon after 'are' is incorrect because the preceding phrase is not an independent clause. The comma option fails to establish the necessary separation for the list.
Selecting the option that conforms to standard rules for colons and semicolons.

Key Concept

A colon must be preceded by a complete independent clause (a complete sentence) and is commonly used to introduce a list, explanation, or clarification.

Alternative Method

To check if a colon is used correctly, read the sentence up to the colon. If it sounds like a complete sentence on its own, and the part after the colon explains or lists the details of the first part, the colon is correct.
Estimated Time:45s
Question 193Question →

In certain dense forests, the uppermost branches of neighboring trees avoid touching one another, instead, they form a network of distinct, channel-like gaps known as 'crown shyness.'

Which choice most effectively punctuates the underlined portion of the sentence?

Show answer & explanation

Answer: another; instead, they

Answer

The choice that reads 'another; instead, they' is correct because a semicolon is required to separate two independent clauses, and 'instead' must be followed by a comma.
The correct option correctly uses a semicolon to join two closely related independent clauses. The conjunctive adverb 'instead' is correctly followed by a comma to introduce the second clause.

Step-by-Step Solution

1
Analyze the two clauses surrounding the underlined portion.
The clause before the underline and the clause after the underline are both independent clauses.
An independent clause contains a subject and a verb and can stand alone as a complete sentence.
2
Determine the appropriate punctuation and transitions.
Since both clauses are independent, they must be separated by a semicolon (or a comma and coordinating conjunction). The conjunctive adverb 'instead' acts as a transition and must be followed by a comma.
This avoids a comma splice or run-on sentence.

Key Concept

Semicolons are used to link two independent clauses that are closely related in thought, often accompanied by a transitional adverb followed by a comma.
Estimated Time:45s
Question 194Question →

In 1928, Scottish biologist Alexander Fleming made an accidental discovery in his laboratory. A strange mold, which grew in a neglected petri dish, was killing the surrounding bacteria. This chance observation led to the development of penicillin, the world's first modern antibiotic.

Which choice best punctuates the underlined portion of the sentence?

Show answer & explanation

Answer: NO CHANGE

Answer

NO CHANGE
The correct choice is the original phrasing because the relative clause 'which grew in a neglected petri dish' is nonessential and is properly set off with a pair of commas: one before the clause starts and one after it ends.

Step-by-Step Solution

1
Determine if the relative clause 'which grew in a neglected petri dish' is essential (restrictive) or nonessential (nonrestrictive) to the basic meaning of the sentence.
The clause is nonessential because 'a strange mold' is already identified, and removing the clause does not alter the main point of the sentence.
Nonessential information must be set off from the rest of the sentence with punctuation, while essential information should not be set off.
2
Select the correct punctuation to set off the nonessential relative clause.
A matching pair of commas must be used, with one comma immediately before the clause and one comma immediately after it.
Omitting one of the commas, using a semicolon, or placing commas around a restrictive clause violates standard punctuation conventions.

Key Concept

Commas with Nonessential and Parenthetical Elements
Estimated Time:45s
Question 195Question →

Which punctuation mark is grammatically appropriate to join the two closely related independent clauses in the sentence below?

Fill in the blanks below

Some species of mushrooms exhibit bioluminescence to attract nocturnal insects these insects then distribute the fungal spores throughout the forest floor.
Show answer & explanation

Answer

A semicolon (;) is the correct punctuation mark to join these two independent clauses.
A semicolon is the grammatically correct punctuation mark to connect two closely related independent clauses when a coordinating conjunction is not used.

Step-by-Step Solution

1
Identify the clauses in the sentence to determine their structure.
The sentence contains two independent clauses: 'Some species of mushrooms exhibit bioluminescence to attract nocturnal insects' and 'these insects then distribute the fungal spores throughout the forest floor'.
Understanding clause boundaries is necessary to determine the appropriate punctuation needed to connect them.
2
Evaluate the relationship between the clauses and select the appropriate punctuation.
Since both clauses are independent, closely related in meaning, and lack a coordinating conjunction (such as 'and' or 'but'), they should be connected with a semicolon.
A semicolon is grammatically used to join closely related independent clauses without creating a run-on sentence or a comma splice.

Key Concept

Semicolons are used to connect two independent clauses that are closely related in thought when no coordinating conjunction is present.
Question 196Question →

During the international pastry competition, the two bakers worked under intense pressure. The bakers' chief concern was it's structural stability, as the warm kitchen threatened to melt the delicate sugar sculpture.

Which choice best corrects the underlined portion of the sentence?

Show answer & explanation

Answer: bakers' chief concern was its

Answer

The correct option is the one that uses the plural possessive noun 'bakers'' and the possessive pronoun 'its' without an apostrophe.
The correct option uses 'bakers'' to indicate the possession of the two bakers (plural possessive) and 'its' as the singular possessive pronoun referring to the sugar sculpture.

Step-by-Step Solution

1
Determine whether the noun describing the possessor of the concern should be singular or plural.
The phrase 'two bakers' indicates that a plural possessive noun is required.
To form the possessive of a plural noun ending in -s, an apostrophe must be placed after the -s, which results in 'bakers''.
2
Determine the correct pronoun to describe the structural stability of the sugar sculpture.
The pronoun refers to the singular 'sugar sculpture', meaning the singular possessive pronoun 'its' (without an apostrophe) is required.
The spelling 'it's' is a contraction for 'it is' or 'it has', which does not fit grammatically in this context, and 'its'' is a non-existent word.
3
Combine the correct noun and pronoun forms to choose the final answer.
The correct combination is 'bakers' chief concern was its'.
This is the only choice that resolves both errors by correctly placing the plural possessive apostrophe and using the proper possessive pronoun.

Key Concept

Apostrophes for Possessives and Contractions
Estimated Time:1m 0s
Question 197Question →

The following passage contains an underlined portion.

In the mid-nineteenth century, the visionary mathematician Ada Lovelace collaborated with inventor Charles Babbage on his mechanical calculator, the Analytical Engine. Lovelace recognized that the machine had applications beyond mere calculation, translating an article on the engine and appending her own extensive commentary. Her detailed notes, which researchers now consider the first computer program described how the machine could compute a sequence of complex numbers.

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

Show answer & explanation

Answer: notes, which researchers now consider the first computer program, described

Answer

The correct choice is the option that sets off the nonessential clause with a pair of commas: 'notes, which researchers now consider the first computer program, described'.
The correct choice sets off the nonessential relative clause ('which researchers now consider the first computer program') with a pair of commas. Since this clause provides descriptive information that is not essential to identifying the noun 'notes,' it must be enclosed in commas to separate it from the main clause.

Step-by-Step Solution

1
Identify whether the underlined relative clause is essential (restrictive) or nonessential (nonrestrictive) to the meaning of the sentence.
The clause 'which researchers now consider the first computer program' is nonessential because the noun it modifies, 'notes,' is already identified by the possessive adjective 'Her detailed.' Removing the clause does not change the core meaning of the sentence.
Nonessential elements must be set off from the rest of the sentence using commas, dashes, or parentheses.
2
Evaluate the punctuation choices to find the one that correctly encloses the nonessential clause with a matching pair of punctuation marks.
The correct punctuation requires a comma both before the clause (after 'notes') and after the clause (after 'program').
This maintains grammatical sentence structure and prevents dangling commas, fragments, or improper separation of the subject 'notes' from its verb 'described'.

Key Concept

Commas with Nonessential and Parenthetical Elements
Estimated Time:1m 0s
Question 198Question →

Read the passage below and answer the question that follows.

Located off the coast of Australia, the Great Barrier Reef is the largest coral reef system on Earth. The Great Barrier Reef, which stretches over 1,400 miles is home to thousands of unique marine species. Protecting this fragile ecosystem is a primary concern for modern marine biologists.

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

Show answer & explanation

Answer: Reef, which stretches over 1,400 miles, is

Answer

The correct choice is the one that sets off the nonessential relative clause with a pair of commas: 'Reef, which stretches over 1,400 miles, is'.
The relative clause 'which stretches over 1,400 miles' is nonessential because the proper noun 'Great Barrier Reef' already specifies exactly which reef is being discussed. Nonessential clauses must be set off from the rest of the sentence using a pair of commas. Placing a comma after 'Reef' and another after 'miles' correctly brackets the information without interrupting the relationship between the subject and its verb.

Step-by-Step Solution

1
Identify the clause modifying the subject.
The clause 'which stretches over 1,400 miles' modifies the subject 'Great Barrier Reef'.
Understanding the function of the modifier helps determine whether it is essential (restrictive) or nonessential (nonrestrictive) to the meaning of the sentence.
2
Determine if the clause is essential or nonessential.
The clause is nonessential because the proper noun 'Great Barrier Reef' already uniquely identifies the subject.
Nonessential elements must be set off with punctuation (a pair of commas), whereas restrictive elements should not have commas.
3
Select the option that correctly encloses the nonessential clause with a pair of commas.
A comma must appear before the relative pronoun 'which' (after 'Reef') and at the end of the clause (after 'miles').
This maintains the grammatical integrity of the sentence by separating the parenthetical information from the main subject and verb ('The Great Barrier Reef... is home').

Key Concept

Commas with Nonessential and Parenthetical Elements
Estimated Time:1m 0s
Question 199Question →

Although the engineering department hired several automotive designers to build the new hybrid vehicle, the designers' main concern was it's heavy battery pack.

Which of the following options represents the correct punctuation and word usage for the underlined portion?

Show answer & explanation

Answer: designers' main concern was its

Answer

The correct answer is 'designers' main concern was its' because it uses the plural possessive form 'designers'' to match the multiple designers mentioned, and the possessive pronoun 'its' to show ownership of the battery pack.
The correct option correctly uses the plural possessive noun 'designers'' to indicate that the concern belongs to the multiple designers mentioned earlier in the sentence. It also properly uses the possessive pronoun 'its' to show that the heavy battery pack belongs to the singular hybrid vehicle.

Step-by-Step Solution

1
Determine if the noun 'designers' should be singular or plural, and possessive.
The context mentions 'several automotive designers', indicating a plural noun. Since the concern belongs to these designers, the plural possessive form 'designers'' (with the apostrophe after the 's') is required.
This establishes the correct noun form based on plural context.
2
Identify the correct pronoun to describe the relationship between the hybrid vehicle and the heavy battery pack.
The battery pack belongs to the singular 'hybrid vehicle', so the singular possessive pronoun 'its' is required.
This avoids homophone confusion with the contraction 'it's' (it is) or the plural contraction 'they're' (they are).
3
Combine the correct noun and pronoun choices to select the right option.
Combining 'designers'' and 'its' yields the correct phrasing: 'designers' main concern was its'.
This ensures both grammatical agreement and correct punctuation are maintained.

Key Concept

Apostrophes for Possessives and Contractions
Estimated Time:1m 0s
Question 200Question →

Choose the alternative that best punctuates the underlined portion of the sentence.

Although the chemists synthesized a dense, dark, metallic compound that was stable at room temperature; they could not determine its catalytic properties.

Show answer & explanation

Answer: dense, dark metallic compound that was stable at room temperature, they could not

Answer

The correct option is 'dense, dark metallic compound that was stable at room temperature, they could not', which correctly uses a comma between coordinate adjectives, leaves cumulative adjectives and restrictive clauses unpunctuated, and uses a comma to join the introductory dependent clause to the main clause.
The correct option properly uses a comma between the coordinate adjectives 'dense' and 'dark' while omitting a comma before the cumulative adjective 'metallic'. It correctly leaves the restrictive relative clause 'that was stable at room temperature' unpunctuated. Finally, it uses a comma to separate the introductory dependent clause from the main independent clause.

Step-by-Step Solution

1
Analyze the adjectives modifying the noun 'compound'.
The adjectives 'dense' and 'dark' are coordinate (can be reversed or joined by 'and') and require a comma. The adjective 'metallic' is cumulative with 'compound' (creates a single unit) and should not be preceded by a comma.
Coordinate adjectives require commas to separate them, whereas cumulative adjectives do not.
2
Evaluate the punctuation around the relative clause 'that was stable at room temperature'.
No commas should surround the relative clause 'that was stable at room temperature'.
The clause is restrictive because it defines which compound is being discussed, and restrictive clauses are not set off by commas.
3
Identify the correct punctuation at the boundary between the two clauses.
A comma is needed after 'temperature' to join the dependent clause to the independent clause.
The sentence begins with the subordinating conjunction 'Although', making the first clause dependent. An introductory dependent clause must be followed by a comma when joined to the main independent clause.

Key Concept

Punctuating coordinate vs. cumulative adjectives, restrictive clauses, and introductory dependent clauses.
Estimated Time:1m 0s
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