Examkin

Conventions of Punctuation

374 questions

All types374Multiple choice326Fill in the blank48
Question 241Question →

For decades, researchers struggled to explain the strange, rhythmic radio signals coming from outer space. Jocelyn Bell, a postgraduate student at Cambridge, first noticed the anomaly. Although she initially suspected the signals were man-made interference. She and her advisor eventually proved that these pulsars were actually rapidly rotating neutron stars.

Which of the following options provides the correct punctuation to fix the underlined portion of the passage?

Show answer & explanation

Answer: anomaly, although she

Answer

The correct answer is the option that replaces the underlined portion with a comma followed by the subordinating conjunction, connecting the independent clause to the dependent clause.
The correct option uses a comma to connect the subordinate dependent clause beginning with 'although' to the main independent clause, creating a single grammatically correct sentence.

Step-by-Step Solution

1
Identify the boundary between the clauses at the underlined portion.
The clause before the boundary ('Jocelyn Bell... first noticed the anomaly') is independent, while the clause after the boundary ('Although she... man-made interference') is dependent because it begins with the subordinating conjunction 'Although'.
Understanding whether each clause is independent or dependent is necessary to apply correct punctuation rules.
2
Evaluate how to connect the independent clause to the dependent clause.
A dependent clause starting with a subordinating conjunction cannot stand alone as a separate sentence. It must be connected to the main clause using a comma, not a period or a semicolon.
This prevents the creation of a sentence fragment or a semicolon error.
3
Review the options to find the choice that correctly connects the clauses without introducing new errors.
Using a comma followed by 'although she' correctly subordinates the clause, whereas removing 'although' creates a comma splice and using a semicolon creates a fragment.
This ensures the final sentence is grammatically correct and coherent.

Key Concept

End-of-sentence punctuation rules for connecting independent and dependent clauses.
Estimated Time:1m 0s
Question 242Question →

In the fifteenth century, the invention of movable type revolutionized the distribution of knowledge across Europe. Gutenberg’s press, which was developed in Mainz, Germany allowed for the rapid mass production of texts. This dramatic shift in book manufacturing helped lay the groundwork for the Renaissance and the Scientific Revolution.

Which choice best punctuates the underlined portion of the sentence?

Show answer & explanation

Answer: press, which was developed in Mainz, Germany, allowed

Answer

press, which was developed in Mainz, Germany, allowed
The correct choice properly sets off the nonessential relative clause 'which was developed in Mainz, Germany' with a pair of commas. Since the clause adds nonessential parenthetical information about Gutenberg's press, it must be separated from the main clause by commas on both sides.

Step-by-Step Solution

1
Determine if the relative clause 'which was developed in Mainz, Germany' is essential or nonessential to the sentence.
The clause is nonessential (nonrestrictive) because it modifies a specific, singular noun 'Gutenberg's press' and can be removed without changing the core meaning of the sentence.
Identifying the nature of the clause determines what punctuation is required.
2
Select the option that correctly sets off this nonessential clause using a matching pair of punctuation marks.
The option containing 'press, which was developed in Mainz, Germany, allowed' correctly uses a comma before 'which' and a comma after 'Germany'.
Nonessential elements must be set off with a pair of matching commas, not a single comma, a semicolon, or commas around a restrictive 'that' clause.

Key Concept

Commas with Nonessential and Parenthetical Elements
Question 243Question →

During the excavation of the ancient Roman villa, archaeologists discovered a cache of intricate, silver coins, they immediately cataloged the artifact details and photographed each piece.

Which option best replaces the underlined portion of the sentence?

Show answer & explanation

Answer: intricate silver coins; they immediately cataloged

Answer

The correct option is the one that reads 'intricate silver coins; they immediately cataloged'.
The correct answer correctly recognizes that 'intricate' and 'silver' are cumulative adjectives and should not be separated by a comma. It also correctly uses a semicolon to separate the two independent clauses.

Step-by-Step Solution

1
Determine if the adjectives modifying the noun are coordinate or cumulative.
The adjectives 'intricate' (opinion) and 'silver' (material) are cumulative because they cannot be reordered ('silver intricate coins' is incorrect) and cannot be joined by 'and'. Therefore, no comma should separate them.
This establishes whether a comma is required between 'intricate' and 'silver'.
2
Analyze the clause structure surrounding the underlined portion.
The clause before the underline ('During the excavation of the ancient Roman villa, archaeologists discovered a cache of...') is independent, and the clause after ('they immediately cataloged the artifact details and photographed each piece') is also independent.
This determines the appropriate punctuation needed to join the two clauses.
3
Evaluate the punctuation choices to join two independent clauses.
A semicolon is appropriate to separate two independent clauses, whereas a comma alone creates a comma splice. A semicolon followed by the subordinating conjunction 'because' incorrectly turns the second clause into a dependent fragment.
This allows us to select the correct punctuation mark that avoids both comma splices and fragments.

Key Concept

Identifying cumulative adjectives and properly separating independent clauses with semicolons.
Question 244Question →

Created in the early 1830s, *The Great Wave off Kanagawa* is one of the most recognizable works of Japanese art. The woodblock print, which depicts three boats navigating a towering wave, features the iconic Prussian blue pigment. This masterpiece helped secure Hokusai's legacy as a pioneer in landscape composition.

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

Show answer & explanation

Answer: NO CHANGE

Answer

NO CHANGE
The correct option properly uses a pair of commas to set off the nonessential relative clause, keeping the sentence grammatically complete and clear.

Step-by-Step Solution

1
Determine if the underlined clause provides essential or nonessential information.
The clause 'which depicts three boats navigating a towering wave' provides additional descriptive information about the woodblock print but is not essential for identifying it. Thus, it is nonessential.
Nonessential information must be set off by punctuation, whereas essential information should not be separated.
2
Apply the correct punctuation to enclose the nonessential element.
Since the nonessential clause is positioned in the middle of the sentence, it must be enclosed by a pair of commas: one after 'print' and one after 'wave'.
A pair of commas prevents the sentence from feeling interrupted or grammatically incorrect.

Key Concept

Commas with Nonessential and Parenthetical Elements
Question 245Question →

To prevent unwanted echoes in a performance space, acoustic engineers design modern concert halls using a variety of specialized materials including: sound-absorbing panels, wooden diffusers, and heavy drapery to control sound reverberation.

Which choice best punctuates the underlined portion of the sentence?

Show answer & explanation

Answer: materials: sound-absorbing panels

Answer

The choice that places a colon directly after 'materials' and before the list of items ('materials: sound-absorbing panels').
The correct choice containing 'materials: sound-absorbing panels' uses a colon appropriately. A colon must be preceded by an independent clause. Since 'To prevent unwanted echoes in a performance space, acoustic engineers design modern concert halls using a variety of specialized materials' can stand alone as a complete sentence, the colon is correct and properly introduces the explanatory list of materials.

Step-by-Step Solution

1
Analyze the clause preceding the punctuation mark to determine if it is independent.
The clause 'To prevent unwanted echoes in a performance space, acoustic engineers design modern concert halls using a variety of specialized materials' is independent because it contains a subject and a verb and expresses a complete thought.
In formal English, a colon must always be preceded by a complete independent clause.
2
Evaluate the relationship between the independent clause and the information that follows it.
The subsequent items ('sound-absorbing panels, wooden diffusers, and heavy drapery') form a list of examples clarifying the 'specialized materials' in the main clause.
A colon is the standard punctuation mark used to introduce a list of examples that explain or amplify a noun in the preceding independent clause.
3
Verify that other options do not introduce new punctuation errors.
Placing a colon after 'including' or using a semicolon to introduce a list are grammatical errors, and a simple comma fails to show the introductory relationship.
This confirms that only the choice with the colon after 'materials' is grammatically correct and appropriate.

Key Concept

A colon must be preceded by an independent clause and is commonly used to introduce a list, explanation, or amplification.
Estimated Time:1m 0s
Question 246Question →

During the stress test of the experimental titanium alloy, the materials scientist observed that the lightweight, durable, metal, deformed under extreme pressure, she decided to adjust the chemical composition for the next trial.

Which option represents the correct punctuation for the underlined portion?

Show answer & explanation

Answer: lightweight, durable metal deformed under extreme pressure; she decided

Answer

lightweight, durable metal deformed under extreme pressure; she decided
The correct answer properly separates the coordinate adjectives 'lightweight' and 'durable' with a comma while keeping the noun 'metal' joined to its modifying adjectives and its verb 'deformed' without unnecessary commas. It also correctly uses a semicolon to separate the two independent clauses.

Step-by-Step Solution

1
Analyze the punctuation between the adjectives 'lightweight' and 'durable' and the noun 'metal'.
Since 'lightweight' and 'durable' are coordinate adjectives (they can be reversed or joined by 'and'), they must be separated by a comma. However, no comma should separate the final adjective from the noun it modifies.
To ensure correct adjective punctuation.
2
Examine the punctuation between the subject 'metal' and the verb 'deformed'.
No punctuation should separate the subject from its verb.
To avoid separating the subject and the verb.
3
Evaluate the clause boundary between the two independent clauses: the observation clause and the decision clause.
Since both parts function as independent clauses, they must be separated by a semicolon or a comma followed by a coordinating conjunction. Using a semicolon with a subordinating conjunction like 'because' creates a dependent clause fragment.
To connect the independent clauses grammatically without creating a comma splice or sentence fragment.

Key Concept

Identifying coordinate adjectives, avoiding punctuation between subject and verb, and correctly connecting independent clauses using semicolons rather than comma splices or dependent clause fragments.
Estimated Time:1m 0s
Question 247Question →

During their long voyages across the Pacific Ocean, ancient Polynesian wayfinders navigated without instruments; instead, they relied on a variety of natural clues, such as: the patterns of ocean swells, the flight paths of nesting seabirds, and the positions of stars.

Which of the following options is the correct way to write the underlined portion?

Show answer & explanation

Answer: clues: the

Answer

clues: the
The correct option replaces the incorrect punctuation with a colon. A colon is appropriate here because the preceding clause ('During their long voyages across the Pacific Ocean, ancient Polynesian wayfinders navigated without instruments; instead, they relied on a variety of natural clues') is independent and can stand alone as a complete sentence, and the colon introduces a list that details those clues.

Step-by-Step Solution

1
Analyze the clause preceding the punctuation to determine if it is independent.
The clause 'During their long voyages across the Pacific Ocean, ancient Polynesian wayfinders navigated without instruments; instead, they relied on a variety of natural clues' is independent and can stand alone as a complete sentence.
A colon can only be used if it is preceded by a complete independent clause.
2
Evaluate the structure of the list following the punctuation.
The text following the punctuation is a list of three noun phrases detailing the natural clues.
A colon is appropriate for introducing a list of items that explain or elaborate on a general term in the preceding clause.
3
Check the distractors against punctuation rules.
The option with 'such as:' is incorrect because 'such as' cannot precede a colon. The option with 'clues. Because the' creates a sentence fragment. The option with 'clues, they studied the' creates a comma splice by joining two independent clauses with a comma.
Eliminating grammatically incorrect punctuation choices confirms the correct option.

Key Concept

Colons must be preceded by an independent clause and can be used to introduce a list, explanation, or elaboration.
Question 248Question →

For centuries, the ancient city of Petra remained hidden from the Western world behind a wall of sandstone cliffs. In 1812, Swiss explorer Johann Ludwig Burckhardt, a scholar who was fluent in Arabic finally gained entry to the valley. Disguised as a Bedouin, he successfully bypassed local guards to document the breathtaking ruins.

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

Show answer & explanation

Answer: Burckhardt, a scholar who was fluent in Arabic,

Answer

The correct option is the one that sets off the nonessential appositive with a pair of commas: 'Burckhardt, a scholar who was fluent in Arabic,'
The correct option correctly uses a pair of commas to set off the nonessential appositive phrase 'a scholar who was fluent in Arabic' from the main clause. Because this phrase provides extra, nonessential information about the explorer, it must be enclosed by commas on both sides.

Step-by-Step Solution

1
Identify whether the underlined phrase is essential or nonessential to the sentence structure.
The phrase 'a scholar who was fluent in Arabic' is an appositive that describes Johann Ludwig Burckhardt. Removing it leaves a grammatically complete sentence: 'In 1812, Swiss explorer Johann Ludwig Burckhardt finally gained entry to the valley.' Therefore, the phrase is nonessential.
Nonessential elements must be set off from the rest of the sentence using punctuation on both sides.
2
Determine the correct punctuation to set off the nonessential appositive.
The appositive begins with a comma after 'Burckhardt', so it must end with a comma after 'Arabic' before the main verb 'finally'. Inside the appositive, the relative clause 'who was fluent in Arabic' is restrictive to 'scholar' and should not be separated from it by a comma. A semicolon cannot be used because the appositive is not an independent clause.
Applying these rules ensures the sentence is grammatically correct and clearly distinguishes between essential and nonessential information.

Key Concept

Commas with Nonessential and Parenthetical Elements
Estimated Time:1m 0s
Question 249Question →

To optimize the acoustics of the newly constructed concert hall, the sound engineer analyzed the performance of various wall panels. During the sound test, she measured the rich, clear, reverberations, but she discovered that the high-frequency notes decayed much too quickly. Consequently, she recommended installing diffusers along the rear wall to balance the sound.

Which choice best punctuates the underlined portion of the sentence?

Show answer & explanation

Answer: rich, clear reverberations, but she discovered

Answer

rich, clear reverberations, but she discovered
The correct option properly places a comma between the coordinate adjectives 'rich' and 'clear' without putting a comma between the final adjective 'clear' and the noun 'reverberations'. It also correctly places a comma before the coordinating conjunction 'but' to separate the two independent clauses.

Step-by-Step Solution

1
Determine if the adjectives modifying the noun are coordinate or cumulative.
The adjectives 'rich' and 'clear' are coordinate because they can be reordered ('clear, rich reverberations') and can be joined with 'and' ('rich and clear reverberations'). Thus, a comma is needed between them.
Coordinate adjectives require commas separating them, while cumulative adjectives do not.
2
Check if a comma should be placed between the final adjective and the noun.
There should be no comma between 'clear' and 'reverberations'.
A comma must never separate the final adjective in a series from the noun it modifies.
3
Examine the clause boundary following the noun.
The clauses before and after 'but' are both independent: 'she measured the rich, clear reverberations' and 'she discovered that the high-frequency notes decayed much too quickly'. A comma is required before the coordinating conjunction 'but'.
Coordinating conjunctions (FANBOYS) joining two independent clauses must be preceded by a comma.

Key Concept

Distinguishing coordinate adjectives from cumulative adjectives and properly separating independent clauses with a coordinating conjunction.
Estimated Time:1m 0s
Question 250Question →

The following passage is an excerpt from a science essay.

Tardigrades, microscopic animals famous for their extreme durability, can survive the vacuum of outer space. These organisms, which are also known as water bears enter a state of cryptobiosis when environmental conditions become too harsh. In this dormant state, they can survive without water for decades.

Which choice best punctuates the underlined portion of the sentence?

Show answer & explanation

Answer: organisms, which are also known as water bears, enter

Answer

organisms, which are also known as water bears, enter
The correct option correctly punctuates the nonessential relative clause 'which are also known as water bears' by enclosing it within a pair of commas, one before 'which' and one after 'bears'. This allows the reader to easily identify the parenthetical information without interrupting the relationship between the subject 'organisms' and the verb 'enter'.

Step-by-Step Solution

1
Analyze the underlined portion of the sentence to determine if the relative clause 'which are also known as water bears' is essential or nonessential.
The clause is nonessential (parenthetical) because 'these organisms' is already specific, and removing the clause does not change the core meaning of the sentence.
Nonessential relative clauses must be set off by punctuation, whereas essential relative clauses must not.
2
Determine the correct punctuation to set off the nonessential relative clause.
The clause must be set off with a pair of commas: one comma before 'which' and one comma after 'bears'.
A parenthetical element in the middle of a sentence requires two commas to prevent leaving a single comma dangling.
3
Eliminate choices that introduce other punctuation errors, such as incorrect semicolon placement or commas around restrictive clauses.
The option using a semicolon is eliminated because it creates a sentence fragment. The option using 'that' with commas is eliminated because 'that' introduces restrictive clauses that must not have commas.
Semicolons are reserved for connecting independent clauses, and restrictive clauses cannot be isolated by commas.

Key Concept

Identifying and punctuating nonessential relative clauses using a matching pair of commas.
Question 251Question →

Read the following passage from an essay on art history:

In the late nineteenth century, the French printmaker Jules Chéret revolutionized advertising by introducing vibrant, large-scale lithographic posters. His work was characterized by a distinct aesthetic; dynamic figures, bold primary colors, and hand-lettered typography.

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

Show answer & explanation

Answer: aesthetic: dynamic

Answer

aesthetic: dynamic
The colon is the correct punctuation mark to introduce a list that clarifies or elaborates on the preceding independent clause. The clause before the colon, describing the printmaker's distinct aesthetic, is a complete sentence, and the list that follows explains that aesthetic.

Step-by-Step Solution

1
Identify the grammatical structure of the clause preceding the punctuation mark.
The clause 'His work was characterized by a distinct aesthetic' contains a subject and a verb and is capable of standing alone as a complete sentence.
Colons and semicolons can only be placed after a clause that is complete and independent.
2
Analyze the grammatical structure of the information following the punctuation mark.
The words 'dynamic figures, bold primary colors, and hand-lettered typography' form a list of noun phrases, which is a dependent fragment.
Since the second part is not an independent clause, a semicolon cannot be used. A colon, however, is appropriate because it can introduce a list that explains the preceding noun.
3
Evaluate the remaining options to eliminate grammatical errors.
Adding the pronoun and verb creates a comma splice, and putting a preposition before the colon violates the rule that a colon must follow a complete sentence.
Eliminating these errors leaves the option with a colon introducing the list as the only grammatically correct choice.

Key Concept

Colons
Question 252Question →

The Library of Alexandria was renowned for housing the greatest collection of texts in the ancient world. The scroll that detailed the calculations, a rare document, was preserved in the inner sanctuary of the library. Only the chief librarian and senior scholars were permitted to access such invaluable resources.

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

Show answer & explanation

Answer: NO CHANGE

Answer

NO CHANGE
The phrase 'that detailed the calculations' is a restrictive (essential) clause because it specifies which scroll is being discussed, so it should not be set off by commas. The phrase 'a rare document' is a nonessential appositive that provides extra information about the scroll, so it must be enclosed in a pair of commas. The correct option properly leaves 'that detailed the calculations' without commas and uses two commas to set off 'a rare document'.

Step-by-Step Solution

1
Identify the role of each modifying clause or phrase in the sentence.
The clause 'that detailed the calculations' restricts the meaning of 'scroll' to a specific one, making it essential. The phrase 'a rare document' provides nonessential descriptive information about the scroll.
Understanding whether an element is essential or nonessential determines whether it requires punctuation.
2
Apply the appropriate punctuation rules to each element.
Essential clauses should not be separated by commas. Nonessential appositives must be enclosed by a pair of commas.
Enclosing nonessential information in commas allows the reader to understand that it can be removed without changing the core meaning of the sentence.
3
Compare the choices to select the one that correctly implements these rules.
The original sentence correctly leaves 'that detailed the calculations' unpunctuated and sets off 'a rare document' with a comma before and after it.
Only this punctuation pattern maintains the correct syntactic relationship between the elements and the main clause.

Key Concept

Distinguishing between essential (restrictive) and nonessential (parenthetical) elements to apply commas correctly.
Question 253Question →

Choose the option that best maintains the sentence's standard written English grammar and punctuation.

To improve the shelf life of the organic packaging, the food chemist synthesized a flexible, transparent, starch film, but the material degraded too quickly under humid conditions.

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

Show answer & explanation

Answer: flexible, transparent starch film, but the material

Answer

The correct answer is the option that correctly separates the coordinate adjectives with a comma, leaves the cumulative adjective unpunctuated, and uses a comma before the coordinating conjunction to join the two independent clauses.
The correct option correctly handles both adjective punctuation and clause separation. First, 'flexible' and 'transparent' are coordinate adjectives because they can be reversed ('transparent, flexible') and can be joined by 'and' ('flexible and transparent'), so they must be separated by a comma. Conversely, 'starch' is a cumulative adjective because it directly modifies the noun 'film' and cannot be naturally reordered (we would not say 'starch, transparent film' or 'transparent and starch film'), so no comma should separate 'transparent' and 'starch'. Second, the sentence contains two independent clauses joined by the coordinating conjunction 'but', which requires a preceding comma to prevent a run-on sentence.

Step-by-Step Solution

1
Analyze the relationship between the adjectives modifying 'film'.
The adjectives are 'flexible', 'transparent', and 'starch'. 'Flexible' and 'transparent' are coordinate adjectives (they can be reversed or joined by 'and'), so they require a comma between them. 'Starch' is a cumulative adjective because it cannot be reversed with the other adjectives (e.g., 'starch, transparent film' is incorrect), so no comma should precede or follow it.
Correctly identifying coordinate versus cumulative adjectives determines where commas are needed within the noun phrase.
2
Identify the clause structure of the sentence.
The sentence consists of an introductory dependent clause followed by two independent clauses: 'the food chemist synthesized...' and 'the material degraded...'.
Determining clause boundaries is essential for choosing the correct punctuation to join them.
3
Select the punctuation that correctly connects the two independent clauses.
Two independent clauses must be joined either by a semicolon alone, or by a comma followed by a coordinating conjunction (such as 'but'). The option with a comma and 'but' correctly connects the clauses without creating a comma splice or using an incorrect semicolon-conjunction combination.
Applying standard punctuation rules for independent clauses ensures grammatical correctness.

Key Concept

Commas with Lists, Clauses, and Coordinate Adjectives
Estimated Time:1m 0s
Question 254Question →

In the following sentence, a portion is underlined: 'To successfully cultivate vanilla orchids, farmers must replicate the vine's native tropical habitat: high humidity, moderate shade, and well-draining soil.' Which choice best completes the sentence, maintaining proper punctuation and grammar?

Show answer & explanation

Answer: habitat: high

Answer

habitat: high
The clause preceding the punctuation is a complete independent clause. A colon is the correct punctuation mark to introduce a list that explains or elaborates on the native tropical habitat.

Step-by-Step Solution

1
Identify the clause preceding the punctuation mark.
The clause 'To successfully cultivate vanilla orchids, farmers must replicate the vine's native tropical habitat' is independent because it contains a subject and a verb and expresses a complete thought.
A colon can only be placed after a clause that can stand alone as a complete sentence.
2
Analyze the grammatical structure of the phrase following the punctuation mark.
The phrase 'high humidity, moderate shade, and well-draining soil' is a list of noun phrases (not an independent clause).
This helps determine which punctuation marks (like semicolons, which require independent clauses on both sides) are incorrect.
3
Select the correct punctuation mark that connects the independent clause to the list.
A colon is the appropriate choice to introduce a list or explanation that follows a complete independent clause.
This maintains proper sentence structure and adheres to standard ACT grammar rules.

Key Concept

A colon is used to introduce a list, explanation, or definition, but it must be preceded by a complete independent clause.
Question 255Question →

In 1842, Italian mathematician Luigi Menabrea published a paper on Charles Babbage's Analytical Engine. Ada Lovelace undertook the task of translating this French document into English. The memoir, which she expanded with her own notes, became a landmark in computer science.

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

Show answer & explanation

Answer: NO CHANGE

Answer

The choice that makes no changes to the underlined portion is correct because the nonessential clause 'which she expanded with her own notes' is correctly punctuated with commas on both sides.
The original sentence correctly identifies the relative clause 'which she expanded with her own notes' as nonessential information. Consequently, it must be enclosed in a pair of commas—one after 'memoir' and another after 'notes'—to separate it from the main independent clause.

Step-by-Step Solution

1
Identify whether the underlined clause is essential (restrictive) or nonessential (nonrestrictive) to the meaning of the sentence.
The clause 'which she expanded with her own notes' provides extra information about 'the memoir' but is not necessary to identify which memoir is being discussed. Therefore, it is a nonessential clause.
Nonessential clauses must be set off from the rest of the sentence using punctuation, typically a pair of commas.
2
Evaluate the options to find the correct punctuation layout for the nonessential clause.
A pair of commas is needed: one before 'which' and one after 'notes'. This matches the original phrasing.
Omitting either comma, using a semicolon instead of a comma, or using the relative pronoun 'that' with commas is grammatically incorrect.

Key Concept

Setting off nonessential and parenthetical elements with a pair of commas
Estimated Time:1m 0s
Question 256Question →

To reconstruct the culinary habits of prehistoric societies, archaeologists analyze ancient pottery shards for chemical residues: lipids, proteins, and complex carbohydrates left behind by long-ago meals.

Which of the following versions of the underlined portion is correct?

Show answer & explanation

Answer: residues: lipids, proteins,

Answer

residues: lipids, proteins,
The correct option is correct because the colon is preceded by an independent clause ('To reconstruct the culinary habits of prehistoric societies, archaeologists analyze ancient pottery shards for chemical residues') and is followed by a list that clarifies the nature of these residues.

Step-by-Step Solution

1
Analyze the clause preceding the punctuation mark to determine if it is independent.
The clause 'To reconstruct the culinary habits of prehistoric societies, archaeologists analyze ancient pottery shards for chemical residues' has a subject and a verb and forms a complete thought.
A colon must be preceded by a complete independent clause.
2
Examine the grammatical structure of the phrase following the punctuation mark to see if it functions as a list or clarification.
The phrase 'lipids, proteins, and complex carbohydrates left behind by long-ago meals' is a list of noun phrases clarifying the chemical residues.
A colon is the correct punctuation mark to introduce a list that clarifies the noun preceding it.
3
Evaluate the other options to ensure they do not introduce punctuation errors, comma splices, or fragment sentences.
The option containing 'which include:' introduces an incomplete clause before the colon. The option containing 'they are' creates a comma splice. The option starting with 'Since' creates a sentence fragment.
ACT standards require grammatical accuracy and correct punctuation.

Key Concept

A colon must be preceded by an independent clause and can be used to introduce a list, explanation, or definition that clarifies the preceding clause.
Question 257Question →

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

In 1952, British biophysicist Rosalind Franklin produced Photo 51, a high-resolution X-ray diffraction image of DNA. The image that Franklin captured was shown to rival scientists James Watson and Francis Crick without her knowledge or consent. Watson and Crick used this key piece of evidence to determine the double-helix structure of the molecule.

Which of the following punctuation choices for the underlined portion is grammatically correct?

Show answer & explanation

Answer: NO CHANGE

Answer

The correct answer is the option containing only the underlined text 'that Franklin captured' without punctuation (NO CHANGE).
The relative clause 'that Franklin captured' is restrictive because it is essential to identifying which specific image is being referred to. Restrictive clauses must not be set off by commas. Therefore, the original phrasing with no punctuation is correct.

Step-by-Step Solution

1
Identify whether the relative clause 'that Franklin captured' is restrictive (essential) or nonrestrictive (nonessential) in the context of the sentence.
The clause specifies exactly which 'image' is being discussed (Photo 51, the one Franklin captured), making it restrictive.
Determining whether a modifier is essential or nonessential is the first step in deciding if it requires commas.
2
Apply the correct punctuation rule for restrictive relative clauses.
Restrictive clauses are not set off by commas or other punctuation.
Because the clause is essential to the meaning of the sentence, it must not be separated from its referent.
3
Evaluate the options to find the correct punctuation layout.
The original sentence has no punctuation around the clause, which is correct (NO CHANGE). The other options incorrectly add commas or semicolons.
Selecting the option that matches the rule of not punctuating restrictive clauses.

Key Concept

Distinguishing between restrictive (essential) and nonrestrictive (nonessential) clauses to apply correct punctuation rules.
Question 258Question →

Many museums now employ advanced laser technology to clean historic paintings, a process that removes soot and varnish without damaging the underlying paint layer. Conservators must still apply traditional methods in tandem; organic solvents, delicate scalpels, and specialized pig-hair brushes.

Which of the following options is the best replacement for the underlined portion?

Show answer & explanation

Answer: methods in tandem: organic

Answer

methods in tandem: organic
The correct choice is the option containing 'methods in tandem: organic' because the sentence before the punctuation mark is an independent clause, and the colon properly introduces a list explaining those traditional methods.

Step-by-Step Solution

1
Identify the grammatical structure of the clause before the underlined portion.
The clause 'Conservators must still apply traditional methods in tandem' is independent because it contains a subject and a verb and expresses a complete thought.
Determining whether the preceding clause is independent is the primary step in deciding if a colon or semicolon can be used.
2
Identify the grammatical structure of the portion following the punctuation.
The phrase 'organic solvents, delicate scalpels, and specialized pig-hair brushes' is a list of nouns and not a complete sentence.
This helps eliminate punctuation marks that require independent clauses on both sides, such as semicolons.
3
Select the correct punctuation mark.
A colon is chosen because it follows an independent clause and introduces a list that directly explains the 'traditional methods' mentioned.
This matches the standard rules for colons on the ACT English section.

Key Concept

A colon must be preceded by an independent clause and can be used to introduce a list, explanation, or elaboration.
Estimated Time:1m 0s
Question 259Question →

The following passage contains an underlined portion.

During Napoleon’s Egyptian campaign in 1799, French soldiers uncovered a black granodiorite slab that would change history. The Rosetta Stone; which featured a decree written in three different scripts, allowed scholars to compare known Greek text with mysterious hieroglyphs. Consequently, French scholar Jean-François Champollion cracked the code in 1822, opening a window into ancient Egyptian civilization.

Which of the following options is the correct punctuation for the underlined portion in the passage?

Show answer & explanation

Answer: Stone, which featured a decree written in three different scripts,

Answer

The correct option is the one that sets off the nonessential clause with a pair of commas: 'Stone, which featured a decree written in three different scripts,'.
The underlined portion introduces a nonessential relative clause ('which featured a decree written in three different scripts') that provides extra information about the Rosetta Stone. In English, nonessential elements must be set off from the rest of the sentence by a pair of commas. The correct option properly uses a comma after 'Stone' and another comma after 'scripts' to enclose this parenthetical clause.

Step-by-Step Solution

1
Identify the type of clause following 'Rosetta Stone'.
The clause 'which featured a decree written in three different scripts' is nonessential because 'Rosetta Stone' already identifies a specific object, meaning the clause only adds extra description.
Identifying the clause type determines the required punctuation rules.
2
Apply the correct punctuation rules for nonessential elements.
A comma must appear before the clause (after 'Stone') and after the clause (after 'scripts').
Nonessential elements must be enclosed by a matching pair of punctuation marks, such as commas, to separate them from the main clause.
3
Eliminate incorrect punctuation choices.
The option using 'that' with commas is incorrect because 'that' is for restrictive clauses. The option using a semicolon creates a fragment. The option missing the closing comma leaves the parenthetical pair incomplete.
Verifying each distractor ensures the selected option is grammatically correct and matches the rules of punctuation.

Key Concept

Commas with Nonessential and Parenthetical Elements
Question 260Question →

In response to the growing demand for sustainable architecture, modern builders are turning to an ancient material; rammed earth, which provides natural insulation and structural durability.

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

Show answer & explanation

Answer: material: rammed

Answer

The choice that reads 'material: rammed' is the correct answer.
The punctuation choice 'material: rammed' is correct because a colon must be preceded by an independent clause (a clause that can stand alone as a sentence). The clause 'In response to the growing demand for sustainable architecture, modern builders are turning to an ancient material' is independent. The colon is then correctly used to introduce the clarifying explanation that identifies the specific material (rammed earth).

Step-by-Step Solution

1
Identify the clause preceding the punctuation mark.
The preceding clause is 'In response to the growing demand for sustainable architecture, modern builders are turning to an ancient material'.
A colon or semicolon must follow an independent clause (a complete thought that can stand alone as a sentence).
2
Determine if the preceding clause is independent.
The clause is independent because it contains a subject ('builders') and a verb ('are turning') and expresses a complete thought.
This confirms that a colon or semicolon could potentially be used, provided the second part of the sentence is punctuated correctly.
3
Analyze the structure of the information following the punctuation.
The phrase 'rammed earth, which provides...' is a noun phrase explaining the ancient material, not an independent clause.
Since the second part is not a complete sentence, a semicolon cannot be used. A colon is appropriate here because it introduces an explanation or clarification of the noun 'ancient material'.
4
Verify that the colon is not preceded by a verb or preposition in the final phrasing.
The correct phrasing is 'material: rammed', which avoids placing the colon directly after a verb ('is') or a preposition ('of').
Placing a colon directly after a verb or preposition makes the preceding clause incomplete, violating standard punctuation rules.

Key Concept

Using colons to introduce lists, explanations, or clarifications after an independent clause.
Estimated Time:1m 0s
PreviousPage 13 / 19Next
Conventions of Punctuation Practice Questions — ACT — Page 13 | Examkin