Examkin

Conventions of Punctuation

374 questions

All types374Multiple choice326Fill in the blank48
Question 281Question →

The following passage contains an underlined portion.

During the late nineteenth century, the Hudson River School painters captured the vastness of the American wilderness. Albert Bierstadt, an artist who traveled extensively throughout the American West depicted these rugged landscapes with dramatic light and sweeping detail, capturing the imagination of viewers who had never traveled beyond the East Coast. Today, his paintings remain iconic representations of the American frontier.

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

Show answer & explanation

Answer: an artist who traveled extensively throughout the American West,

Answer

The correct option is the one that includes a comma after the word 'West' to properly close the nonessential appositive phrase describing the artist.
The nonessential appositive phrase 'an artist who traveled extensively throughout the American West' describes the subject 'Albert Bierstadt.' Because the sentence already contains an opening comma before this phrase, a closing comma must be placed after 'West' to set it off. This correctly separates the parenthetical description from the main verb 'depicted.'

Step-by-Step Solution

1
Identify the subject and verb of the main clause.
The subject is 'Albert Bierstadt' and the main verb is 'depicted.'
Locating the core subject and verb helps identify where modifying or parenthetical information starts and ends.
2
Determine if the underlined phrase is essential or nonessential to the sentence.
The phrase 'an artist who traveled extensively throughout the American West' is an appositive that provides additional descriptive details about Albert Bierstadt, which means it is nonessential (nonrestrictive).
Nonessential elements must be set off from the main clause by a pair of commas.
3
Check the surrounding punctuation to ensure the nonessential phrase is properly enclosed.
An opening comma is already present after 'Albert Bierstadt,' so a matching closing comma must be placed at the end of the phrase, directly after the word 'West.'
Using a single comma instead of a pair leaves the punctuation dangling and incorrectly merges the nonessential modifier with the predicate.

Key Concept

Nonessential elements, such as appositives and parenthetical phrases, must be set off from the main sentence by a pair of matching punctuation marks, usually commas.
Estimated Time:1m 0s
Question 282Question →

The single-celled slime mold *Physarum polycephalum* lacks a brain, yet it can solve complex mazes to find food. As it moves, the organism deposits a trail of translucent secretion behind it. This extracellular slime, which contains a chemical compound that is soluble, helps the mold navigate by signaling which paths it has already explored.

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

Show answer & explanation

Answer: NO CHANGE

Answer

The correct choice is 'NO CHANGE' because it properly closes the nonessential clause with a comma while keeping the restrictive modifier free of punctuation.
The correct choice is the one that places a comma after 'soluble' to close the nonessential clause starting with 'which' without inserting commas around the restrictive modifier 'that is soluble.'

Step-by-Step Solution

1
Identify the main subject and verb, and locate any intervening clauses.
The main subject is 'This extracellular slime' and the main verb is 'helps.' The clause 'which contains a chemical compound that is soluble' is an intervening nonessential element.
Nonessential relative clauses must be enclosed by a pair of commas to separate them from the main sentence structure.
2
Analyze the sub-clause 'that is soluble' to determine if it is restrictive or nonrestrictive.
The clause 'that is soluble' is restrictive because it restricts the meaning of 'compound' to a specific type, so it must not have commas around it.
Restrictive clauses are essential to the meaning of a sentence and should not be set off by commas.
3
Combine these punctuation decisions to find the correct choice.
A comma is required after 'soluble' to close the nonessential clause, and no commas should surround 'that is soluble.' This corresponds to 'NO CHANGE.'
This choice correctly coordinates the punctuation of both the nonessential relative clause and the restrictive clause.

Key Concept

Commas with Nonessential and Parenthetical Elements
Question 283Question →

The passage below contains an underlined portion.

Discovered in 1799 by French soldiers rebuilding a fort, the Rosetta Stone—a broken granodiorite stele inscribed with a royal decree, provided the key to deciphering ancient Egyptian hieroglyphs.

Which choice best punctuates the underlined portion of the sentence?

Show answer & explanation

Answer: Stone—a broken granodiorite stele inscribed with a royal decree—

Answer

Stone—a broken granodiorite stele inscribed with a royal decree—
The correct choice uses a matched pair of dashes to enclose the nonessential appositive phrase 'a broken granodiorite stele inscribed with a royal decree'. When setting off nonessential information within a sentence, punctuation must be consistent: dashes must be paired with dashes, commas with commas, or parentheses with parentheses.

Step-by-Step Solution

1
Identify the nonessential information in the sentence that acts as an appositive clarifying 'Rosetta Stone'.
The phrase 'a broken granodiorite stele inscribed with a royal decree' is nonessential and should be set off by matching punctuation marks.
Nonessential elements must be set off from the rest of the sentence using commas, parentheses, or dashes.
2
Analyze the punctuation surrounding the nonessential phrase to ensure consistency.
The original sentence opens the phrase with a dash but attempts to close it with a comma, which is inconsistent.
To maintain punctuation consistency, an opening dash must be paired with a closing dash.
3
Evaluate the choices to find the one that correctly uses a pair of dashes or a pair of commas without introducing fragments.
The choice that changes the closing comma to a dash matches the opening dash and correctly punctuates the sentence.
This maintains the grammatical integrity of the sentence and respects the dash-pair consistency rule.

Key Concept

Using consistent pairs of dashes to enclose nonessential parenthetical elements.
Question 284Question →

In forest ecosystems, mycelium—the dense, underground network of fungal threads—decomposes organic matter and distributes nutrients among trees. This complex web [—which connects different plant species, allows] trees to share resources and communicate with one another in a form of symbiotic cooperation.

Which of the following choices best punctuates the underlined portion in brackets?

Show answer & explanation

Answer: —which connects different plant species—allows

Answer

—which connects different plant species—allows
The sentence contains a non-essential relative clause modifying 'web'. Non-essential elements must be set off by matching punctuation marks: two commas, two parentheses, or two em dashes. Since the clause is introduced with an em dash, it must be closed with a matching em dash before the main verb 'allows'.

Step-by-Step Solution

1
Identify the syntactic role of the clause inside the brackets.
The clause 'which connects different plant species' is a non-essential relative clause that modifies the subject 'This complex web'.
Identifying if a modifier is non-essential determines if it requires paired punctuation.
2
Evaluate the punctuation consistency.
The clause begins with an em dash, so it must be terminated with a matching em dash before the main verb 'allows'.
Setting off parenthetical information requires consistent punctuation marks (two dashes, two commas, or two parentheses) rather than mismatched marks like a dash and a comma.

Key Concept

Dashes
Estimated Time:1m 0s
Question 285Question →

The following passage is about the development of the periodic table.

In 1869, the Russian chemist Dmitri Mendeleev published his first version of the periodic table. He organized the elements by their atomic masses, leaving gaps for elements that had not yet been discovered. The predicted elements, which Mendeleev described in detail were later isolated and found to match his predictions with remarkable accuracy.

Which choice best punctuates the underlined portion of the passage?

Show answer & explanation

Answer: elements, which Mendeleev described in detail,

Answer

elements, which Mendeleev described in detail,
The clause 'which Mendeleev described in detail' is nonessential because the noun phrase it modifies, 'The predicted elements,' is already specific. Therefore, the clause must be enclosed by a pair of commas. The option containing a comma after both 'elements' and 'detail' is correct.

Step-by-Step Solution

1
Identify the clause within the sentence structure.
The clause 'which Mendeleev described in detail' modifies 'predicted elements'.
Determining the boundary of the clause helps determine where punctuation is needed.
2
Determine if the clause is essential (restrictive) or nonessential (nonrestrictive).
The clause is nonessential because 'predicted elements' already clearly specifies which elements are being discussed; removing the clause does not change the core meaning of the sentence.
Nonessential elements must be set off with punctuation, whereas essential elements should not be punctuated.
3
Apply the correct punctuation rule for nonessential relative clauses.
The relative clause must be enclosed by a pair of commas (one before 'which' and one after 'detail').
Using a pair of commas correctly isolates the parenthetical information without interrupting the flow of the main sentence.

Key Concept

Nonessential (parenthetical) relative clauses must be set off by a pair of commas.
Estimated Time:1m 0s
Question 286Question →

The passage below contains a non-essential modifier. Which punctuation mark should be placed in the blank to ensure the sentence is punctuated correctly?

Fill in the blanks below

Though often viewed as simple scavengers, spotted hyenas are highly sophisticated hunters—working in coordinated packs to bring down preythat display complex social structures rivaling those of some primates.
Show answer & explanation

Answer

A dash (—)
The non-essential descriptive phrase 'working in coordinated packs to bring down prey' is introduced by an em dash after the word 'hunters'. To maintain punctuation consistency, the phrase must be closed with another em dash before the relative pronoun 'that'. Mixing punctuation marks to set off a single parenthetical element is incorrect.

Step-by-Step Solution

1
Identify the parenthetical (non-essential) element in the sentence.
The phrase 'working in coordinated packs to bring down prey' is non-essential and could be removed without changing the core meaning or grammatical structure of the sentence.
This helps determine which punctuation marks are setting off this modifying phrase.
2
Examine the punctuation that introduces the non-essential phrase.
The phrase is introduced by an em dash ('—') after the word 'hunters'.
In English grammar and ACT style, non-essential elements must be set off by matching punctuation marks: either two commas, two parentheses, or two dashes.
3
Select the matching punctuation mark for the end of the phrase.
To match the opening em dash, the blank must be filled with a closing em dash ('—').
Using a comma, semicolon, or parenthesis would violate punctuation consistency rules.

Key Concept

Punctuation consistency with non-essential elements
Question 287Question →

A student is editing a draft of an essay about modern art history. Based on the paragraph below, which punctuation mark should be placed in the blank to ensure the sentence is punctuated correctly?

Fill in the blanks below

The Mexican painter Frida Kahlo—best known for her uncompromising and vividly colored self-portraits focused her work on themes of identity, the human body, and death. Although she was active in the mid-twentieth century, her artwork did not receive widespread international acclaim until decades after her passing. Today, she is celebrated worldwide as a pioneer of modern art.
Show answer & explanation

Answer

A dash (—) is required to close the nonessential phrase because it was opened with a matching dash.
The sentence contains a nonessential explanatory phrase set off by punctuation. Because the phrase is introduced with a dash, a matching dash must be used to close the phrase to maintain punctuation consistency.

Step-by-Step Solution

1
Identify the nonessential explanatory phrase within the main clause.
The phrase 'best known for her uncompromising and vividly colored self-portraits' is a nonessential modifier describing Frida Kahlo.
Nonessential phrases provide extra information that can be removed without changing the core grammatical structure of the sentence.
2
Examine the punctuation mark that opens the nonessential phrase.
The phrase is introduced with an em dash (—).
To maintain punctuation consistency, nonessential phrases must be enclosed by matching punctuation marks (two commas, two parentheses, or two dashes).
3
Determine the correct punctuation mark to close the nonessential phrase.
A matching em dash (—) must be placed in the blank.
Using a comma, semicolon, or parenthesis would create mismatched punctuation, violating consistency rules.

Key Concept

Dashes must be used in matching pairs when setting off parenthetical or nonessential information within a sentence.
Estimated Time:1m 0s
Question 288Question →

The following passage is about the history of climate science.

In 1856, the American scientist Eunice Foote conducted pioneering experiments on the warming effects of various gases. She discovered that a receiver filled with carbon dioxide heated up much more than one filled with common air. Ultimately, she concluded that carbon dioxide, a greenhouse gas that absorbs heat, could significantly alter the Earth's climate.

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

Show answer & explanation

Answer: NO CHANGE

Answer

The correct option is the one that leaves the sentence unchanged, as it correctly uses a pair of commas to enclose the nonessential appositive phrase and does not introduce unnecessary punctuation within the restrictive clause.
The correct option correctly uses a pair of commas to set off the nonessential appositive phrase 'a greenhouse gas that absorbs heat.' Because this phrase is descriptive and can be removed without affecting the main sentence's meaning, it must be enclosed by commas. Additionally, the restrictive relative clause 'that absorbs heat' is correctly left unpunctuated because it is essential to the meaning of the noun 'gas'.

Step-by-Step Solution

1
Identify whether the underlined phrase is essential or nonessential to the sentence.
The phrase 'a greenhouse gas that absorbs heat' is a nonessential appositive that describes 'carbon dioxide'. Removing it does not change the core grammatical structure or meaning of the sentence.
Nonessential elements must be set off from the rest of the sentence with punctuation, typically commas.
2
Determine the appropriate placement of commas around the nonessential phrase.
A pair of commas is needed: one before the phrase (after 'dioxide') and one after the phrase (after 'heat').
Single dangling commas fail to enclose parenthetical information and create punctuation errors.
3
Analyze internal punctuation of the phrase for restrictive modifiers.
The clause 'that absorbs heat' is a restrictive relative clause modifying 'greenhouse gas' and must not be separated from it by a comma.
Restrictive clauses are essential to define their referent and should never be enclosed in commas.
4
Evaluate the choices to find the one that matches these rules.
The original sentence has a comma after 'dioxide' and after 'heat', and no comma before 'that'. Semicolons cannot set off nonessential appositives because they are not independent clauses.
This confirms that the original punctuation is correct and no change is needed.

Key Concept

Commas with Nonessential and Parenthetical Elements
Question 289Question →

Read the following passage and choose the option that best corrects the underlined portion.

The mimic octopus—a remarkable marine creature discovered in the late 1990s off the coast of Sulawesi, possesses the unique ability to impersonate other sea animals. By altering its body shape and color, it can mimic venomous species such as lionfish, sea snakes, and flatfish. This behavior allows the octopus to deter predators that would otherwise consider it an easy meal.

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

Show answer & explanation

Answer: Sulawesi—possesses

Answer

Sulawesi—possesses
The correct answer properly balances the punctuation of the sentence. The nonessential parenthetical phrase that describes the mimic octopus begins with an em dash ('—a remarkable marine creature...'). To maintain structural consistency, the phrase must also end with an em dash before the main verb of the sentence ('possesses').

Step-by-Step Solution

1
Identify the syntactic role of the underlined punctuation and surrounding text.
The phrase starting with '—a remarkable marine creature...' is a nonessential explanatory phrase (an appositive) that describes the mimic octopus.
Recognizing that this is a parenthetical or nonessential element helps determine that it must be set off by matching punctuation marks.
2
Check the punctuation at the beginning of the nonessential phrase.
The phrase is introduced by an em dash ('—').
Nonessential phrases set off by dashes must use a pair of dashes (one at the beginning and one at the end) to maintain punctuation consistency.
3
Select the option that properly closes the nonessential phrase with a matching dash.
The choice containing 'Sulawesi—possesses' correctly closes the nonessential phrase with a dash and connects it back to the main verb.
This maintains punctuation consistency without introducing fragments or run-on sentences.

Key Concept

Punctuation consistency with nonessential parenthetical phrases (dash pairs)
Estimated Time:1m 0s
Question 290Question →

During the Edo period in Japan, artists perfected the genre of woodblock printing known as ukiyo-e. These vibrant prints, which depicted scenes of theater, travel, and daily life, became highly popular among the merchant class. Because this collaborative production method involved an artist, a carver, and a publisher, workshops could easily mass-produce the prints for a growing audience.

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

Show answer & explanation

Answer: NO CHANGE

Answer

NO CHANGE
The underlined portion is correct as written. The relative clause starting with 'which' is nonessential because it provides extra descriptive information about 'prints' that is not necessary to identify them. Nonessential clauses must be set off from the rest of the sentence with commas both before and after the clause.

Step-by-Step Solution

1
Identify the clause embedded within the sentence.
The clause is 'which depicted scenes of theater, travel, and daily life'.
Determining the boundaries of the clause helps analyze its punctuation needs.
2
Determine if the clause is essential (restrictive) or nonessential (nonrestrictive) to the meaning of the sentence.
The clause is nonessential because 'These vibrant prints' is already specific; the clause only adds descriptive detail.
Nonessential elements must be set off with a pair of commas, whereas essential elements should not have commas.
3
Select the option that correctly sets off this nonessential relative clause with two commas.
The correct choice is the original phrasing, which has a comma before 'which' and a comma after 'life'.
Only the correct choice provides balanced punctuation for the nonessential clause without introducing errors like semicolons or restrictive relative pronouns.

Key Concept

Commas with Nonessential and Parenthetical Elements
Estimated Time:1m 0s
Question 291Question →

The passage below contains a blank indicating a missing punctuation mark. Read the passage and determine which punctuation mark correctly completes the sentence. In the blank provided, what punctuation mark should be placed to ensure the sentence is punctuated correctly?

Fill in the blanks below

Astronomers have long wondered whether other stars in the universe host planets similar to our own. The Kepler space telescope—launched in 2009 to search for Earth-size planets orbiting other starsrevolutionized our understanding of the galaxy by discovering thousands of exoplanets. By monitoring the brightness of over 150,000 stars, Kepler detected the tiny dips in light caused by orbiting planets passing in front of them.
Show answer & explanation

Answer

A dash (—) is the correct punctuation mark to place in the blank.
A dash is correct because it matches the em dash that opens the nonessential parenthetical phrase describing the Kepler space telescope. Under standard English conventions, nonessential elements set off by dashes must be closed with a matching dash to maintain structural consistency.

Step-by-Step Solution

1
Identify the parenthetical, nonessential element in the sentence.
The phrase 'launched in 2009 to search for Earth-size planets orbiting other stars' is a nonessential modifier that provides extra background information about the Kepler space telescope.
Recognizing the syntactic role of the phrase helps determine the punctuation rules that apply to it.
2
Check the punctuation used to introduce the parenthetical element.
The parenthetical element begins with an em dash (—) immediately following the word 'telescope'.
This establishes that the parenthetical phrase is set off by dashes.
3
Apply the rule of punctuation consistency to find the matching mark.
Since the nonessential element is opened with a dash, it must be closed with a matching dash before the main verb 'revolutionized'.
Mismatched punctuation (such as pairing a dash with a comma or parenthesis) is grammatically incorrect on the ACT.

Key Concept

Dash Pair Consistency
Estimated Time:1m 0s
Question 292Question →

A student is writing an essay about unique linguistic traditions. The passage below contains an underlined portion that may contain a punctuation error.

Historically spoken on the Canary Island of La Gomera, Silbo Gomero is a whistled language that mimics the phonetic structure of Spanish. The rugged topography of the island—a landscape defined by deep ravines and steep valleys—made whistling an efficient way to communicate across distances of up to five kilometers. Because the language translates Spanish vowels and consonants into high- and low-pitched whistles, speakers—known locally as *silbadores*, can convey complex messages across the mountainous terrain. Historically used by shepherds, this unique form of communication is now taught in local schools to ensure its survival.

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

Show answer & explanation

Answer: speakers—known locally as *silbadores*—can

Answer

The option that uses matching dashes, written as 'speakers—known locally as *silbadores*—can', is correct because it maintains punctuation consistency to set off the parenthetical description.
The correct answer correctly uses a pair of dashes to set off the nonessential appositive phrase 'known locally as *silbadores*'. When a sentence contains a nonessential element in the middle, it must be enclosed by a matching pair of punctuation marks (either two commas, two dashes, or two parentheses). Since the parenthetical phrase begins with a dash after 'speakers', it must also end with a dash before 'can'.

Step-by-Step Solution

1
Identify the parenthetical (nonessential) phrase in the sentence.
The phrase 'known locally as *silbadores*' adds extra details about the speakers but is not essential to the core grammatical structure of the sentence.
Nonessential phrases must be set off from the rest of the sentence by a matching pair of punctuation marks (commas, dashes, or parentheses).
2
Evaluate the punctuation surrounding the nonessential phrase for consistency.
The phrase begins with a dash ('speakers—'). Therefore, it must end with a matching dash before the main verb 'can' ('*silbadores*—can').
Using mismatched punctuation (such as starting with a dash and ending with a comma, semicolon, or period) violates the rule of punctuation consistency and creates grammatical errors.

Key Concept

Punctuation consistency with dashes for nonessential parenthetical phrases
Question 293Question →

Archaeologists studying the Nabataean empire have uncovered sophisticated water management systems in the desert. These systems—crucial for survival in the arid environment, allowed a thriving civilization to flourish.

Which of the following options is the correct punctuation for the bolded portion?

Show answer & explanation

Answer: environment—allowed

Answer

environment—allowed
The correct answer correctly closes the parenthetical non-essential phrase with a dash ('—') to match the dash that opens the phrase after the word 'systems'. This preserves grammatical symmetry and prevents punctuation mismatch.

Step-by-Step Solution

1
Identify the non-essential parenthetical phrase in the sentence.
The phrase starting with '—crucial for survival...' provides extra information about the 'systems' and is non-essential.
Recognizing the structure helps determine what punctuation rules apply to enclosing this information.
2
Check the opening punctuation mark of the parenthetical phrase.
The phrase opens with a dash ('—') directly after the word 'systems'.
Punctuation marks used to set off non-essential elements must be consistent (comma with comma, parenthesis with parenthesis, or dash with dash).
3
Select the option that matches the opening punctuation mark to close the phrase.
A dash must be placed after 'environment' to match the dash before 'crucial'.
This maintains dash pair consistency and properly links the subject 'These systems' with its verb 'allowed'.

Key Concept

Dash Pair Consistency
Estimated Time:45s
Question 294Question →

The following sentence contains an underlined portion: 'While exploring the depths of the local cave system, the geologist discovered a smooth, dark, limestone, shelf that had been carved by water over thousands of years.' Which choice represents the correct punctuation for the underlined portion?

Show answer & explanation

Answer: smooth, dark limestone shelf

Answer

The option containing 'smooth, dark limestone shelf' is correct because it correctly uses a comma to separate the coordinate adjectives 'smooth' and 'dark' while avoiding unnecessary commas before the noun adjunct 'limestone' and the noun 'shelf'.
The adjectives 'smooth' and 'dark' are coordinate adjectives because they both modify the noun phrase 'limestone shelf' independently (one can say 'a smooth and dark limestone shelf'). Therefore, they must be separated by a comma. However, 'limestone' acts as a noun adjunct directly modifying 'shelf', forming a compound noun phrase, so no comma should separate 'dark' from 'limestone' or 'limestone' from 'shelf'.

Step-by-Step Solution

1
Identify the adjectives and the noun being modified in the underlined portion.
The words 'smooth' and 'dark' are adjectives modifying the noun phrase 'limestone shelf'.
Understanding the relationship between the modifiers and the noun helps determine where commas are required or prohibited.
2
Determine if 'smooth' and 'dark' are coordinate adjectives.
They are coordinate because you can swap their order ('dark, smooth') or place 'and' between them ('smooth and dark') without changing the meaning.
Coordinate adjectives must be separated by a comma.
3
Evaluate whether 'limestone' is coordinate with 'smooth' and 'dark'.
It is not coordinate; you cannot say 'smooth and limestone' or 'dark and limestone shelf' naturally. 'Limestone' is a noun adjunct modifying 'shelf'.
No comma should be placed between a coordinate adjective and a non-coordinate noun adjunct, nor between the adjunct and the noun it modifies.

Key Concept

Coordinate adjectives modify the same noun independently and require a comma between them, whereas cumulative adjectives or noun adjuncts do not take commas.
Question 295Question →

The software engineer ran the automated diagnostic tests multiple times, she could not identify the source of the memory leak. Which choice best punctuates the underlined portion of the sentence?

Show answer & explanation

Answer: times, but she could not identify

Answer

times, but she could not identify
The correct option correctly joins the two independent clauses using a comma followed by the coordinating conjunction 'but'. This follows standard English grammar rules for connecting independent clauses.

Step-by-Step Solution

1
Identify the structure of the two clauses being connected.
The clause before the underlined portion ('The software engineer ran the automated diagnostic tests multiple times') and the clause after ('she could not identify the source of the memory leak') are both independent clauses.
Knowing the clause types helps determine the correct punctuation needed to join them.
2
Evaluate the standard ways to connect two independent clauses.
Two independent clauses can be joined by a semicolon, or by a comma followed by a coordinating conjunction (such as 'but').
This rules out options that cause comma splices or run-on errors.
3
Select the option that correctly implements one of these standard rules without adding unnecessary commas.
The option containing a comma followed by the coordinating conjunction 'but' correctly connects the clauses.
It maintains standard grammatical structure and resolves the comma splice.

Key Concept

Connecting two independent clauses requires a semicolon or a comma combined with a coordinating conjunction.
Question 296Question →

For her art history presentation, Mia chose to discuss the vibrant colors; bold brushstrokes; and emotional depth of Vincent van Gogh's paintings.

Which choice best maintains standard written English grammar and punctuation?

Show answer & explanation

Answer: colors, bold brushstrokes, and

Answer

The choice that provides the correct list punctuation and maintains parallel structure is 'colors, bold brushstrokes, and'.
The correct answer uses commas to separate the three items in a series ('colors', 'brushstrokes', and 'depth') and includes the coordinating conjunction 'and' before the final item, maintaining parallel noun phrases.

Step-by-Step Solution

1
Identify the list of items being described in the sentence.
The sentence presents a list of three attributes: 'colors', 'brushstrokes', and 'depth'.
Understanding the structure of the sentence is necessary to determine the correct punctuation.
2
Determine the correct punctuation rules for separating items in a simple list.
A list of three items requires commas separating the items and a coordinating conjunction before the final item.
Applying standard list punctuation ensures readability and correct grammar.
3
Verify that all items in the list maintain parallel structure as noun phrases.
The final phrase 'emotional depth' is a noun phrase, matching 'vibrant colors' and 'bold brushstrokes'.
Maintaining parallel grammatical forms is required for lists in standard written English.

Key Concept

Punctuation of elements in a series (lists) and maintaining parallel structure.
Question 297Question →

To attract local pollinators to the community garden, the volunteers planted lavender, marigolds, and salvia, in the central flower beds.

Which choice best punctuates the underlined portion of the sentence?

Show answer & explanation

Answer: lavender, marigolds, and salvia in

Answer

The option that correctly lists the plants with commas and has no punctuation after the final plant is correct.
The correct option correctly uses commas to separate the three items in the list ('lavender, marigolds, and salvia') and does not place any punctuation after the final item, allowing the sentence to transition smoothly into the modifying prepositional phrase.

Step-by-Step Solution

1
Identify the items in the list.
The sentence lists three plants: 'lavender', 'marigolds', and 'salvia'.
Lists of three or more items require punctuation to separate them clearly.
2
Determine the correct punctuation to separate the list items.
Commas are needed after 'lavender' and 'marigolds' (the comma before 'and' is the Oxford comma, which is standard on the ACT).
Items in a list of three or more must be separated by commas.
3
Analyze whether any punctuation should follow the final item in the list.
No comma should follow 'salvia' before the prepositional phrase 'in the central flower beds'.
Punctuation should not separate the final item of a list from the rest of the clause or modifier that immediately follows it.

Key Concept

Commas in a series (lists of three or more items)
Question 298Question →

Because the botanist needed to collect various plant specimens, she searched the meadow for wild daisies, red clover, and sweet clover.

Which choice best punctuates the underlined portion of the sentence?

Show answer & explanation

Answer: specimens, she searched the meadow for wild daisies, red clover, and

Answer

The correct option is the one that retains the comma after 'specimens' to separate the introductory dependent clause from the main clause, and maintains the standard series of commas with the coordinating conjunction 'and' to separate the list items.
The correct choice properly separates the introductory dependent clause from the independent clause with a comma. It also correctly punctuates the list of three items by placing a comma after each of the first two items and before the coordinating conjunction.

Step-by-Step Solution

1
Identify the clause boundary
The sentence begins with the subordinating conjunction 'Because', making 'Because the botanist needed to collect various plant specimens' a dependent introductory clause. Standard English conventions require a comma after this clause to separate it from the main independent clause.
Introductory dependent clauses must be separated from the main clause by a comma.
2
Analyze the list structure
The sentence contains a three-item list: 'wild daisies', 'red clover', and 'sweet clover'. Standard punctuation requires commas separating the items, with a comma and a coordinating conjunction before the final item.
Commas are used to separate items in a list of three or more elements.
3
Evaluate the choices
The original phrasing uses a comma after 'specimens' and the correct list punctuation 'wild daisies, red clover, and'. Semicolons cannot separate dependent clauses, comma placement after 'and' is incorrect, and replacing the conjunction with a new clause creates a comma splice.
Option A is correct, while other options introduce grammatical errors like fragments, misplaced commas, or comma splices.

Key Concept

Commas with Lists, Clauses, and Coordinate Adjectives
Question 299Question →

For the science experiment, the students need to bring a plastic bottle, a roll of duct tape, and a pair of scissors to class tomorrow.

Which choice best punctuates the underlined portion of the sentence?

Show answer & explanation

Answer: NO CHANGE

Answer

The option stating 'NO CHANGE' is the correct choice because the list of three items is correctly separated by commas, including the serial comma before the conjunction 'and'.
The correct answer is the option stating 'NO CHANGE' because it properly separates all three elements of the list with commas, including the comma before the coordinating conjunction 'and' (the serial or Oxford comma).

Step-by-Step Solution

1
Identify the structure of the underlined portion of the sentence.
The underlined text contains a simple list of three items: 'a plastic bottle', 'a roll of duct tape', and 'a pair of scissors'.
Determining the grammatical structure helps identify the correct punctuation rules to apply.
2
Apply standard rules for punctuating a series of three or more items.
Commas must separate each item, and a serial comma should appear before the coordinating conjunction 'and'. This yields: 'a plastic bottle, a roll of duct tape, and a pair of scissors'.
Using commas correctly avoids confusing the reader and maintains parallel structure in a list.
3
Evaluate the choices to find the one that matches this correct punctuation.
The original sentence is already punctuated correctly, which corresponds to the choice stating 'NO CHANGE'.
Comparing the choices ensures the selected option is grammatically accurate.

Key Concept

Punctuation of items in a simple three-item list using commas and a coordinating conjunction.
Estimated Time:45s
Question 300Question →

Although the recipe was complex, the amateur chef managed to bake a perfect soufflé.

Which choice is correct?

Show answer & explanation

Answer: NO CHANGE

Answer

The choice 'NO CHANGE' is correct because it properly maintains the comma separating the introductory dependent clause from the subsequent independent clause.
The correct answer properly uses a comma to separate the introductory dependent clause ('Although the recipe was complex') from the main independent clause ('the amateur chef managed to bake a perfect soufflé'). This matches standard conventions of punctuation.

Step-by-Step Solution

1
Analyze the structure of the clauses in the sentence.
The first clause ('Although the recipe was complex') is dependent, and the second clause ('the amateur chef managed to bake a perfect soufflé') is independent.
Identifying clause types helps determine the correct punctuation rules to apply.
2
Apply the rule for introductory dependent clauses.
An introductory dependent clause must be followed by a comma when it precedes an independent clause.
A comma is required to separate an introductory modifier or clause from the main subject and verb that follow.
3
Evaluate the choices against punctuation conventions.
Only the original punctuation uses a comma to connect the dependent and independent clauses without introducing errors such as fragments or comma splices.
A semicolon or period would incorrectly isolate the dependent clause, and removing the subordinator creates a comma splice.

Key Concept

Commas with introductory dependent clauses
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Conventions of Punctuation Practice Questions — ACT — Page 15 | Examkin