Examkin

Sentence Structure and Formation

444 questions

All types444Multiple choice368Ordering15Fill in the blank61
Question 61Question →

The following passage contains an underlined portion.

Deep-sea hydrothermal vents, first discovered in 1977 near the Galápagos Rift, support thriving ecosystems in complete darkness. These communities, relying on chemosynthetic bacteria that convert toxic hydrogen sulfide into organic matter. This process forms the foundation of a food web entirely independent of sunlight.

Which of the following choices represents the most grammatically correct revision of the underlined portion?

Show answer & explanation

Answer: These communities rely on chemosynthetic bacteria that convert toxic hydrogen sulfide into organic matter. This

Answer

The option that changes the participle 'relying' to the finite verb 'rely' and uses a period to separate the two independent clauses.
The correct choice changes the participle 'relying' to the finite verb 'rely,' which provides the verb needed to make the first clause a complete independent sentence. It also uses a period to correctly separate this sentence from the next independent sentence starting with 'This process.'

Step-by-Step Solution

1
Analyze the underlined portion to see if it forms a complete sentence.
The subject is 'These communities', but the only verb-like word in the clause is the participle 'relying', which cannot act as a main verb. This leaves the clause as an ungrammatical sentence fragment.
A complete sentence requires both a subject and a finite verb to express a complete thought.
2
Evaluate the choices to find which one corrects the fragment.
Changing the participle 'relying' to the finite verb 'rely' provides the necessary verb to make 'These communities rely on...' a complete independent clause.
The main clause must contain a finite verb to resolve the fragment.
3
Verify that the punctuation between the new independent clause and the next independent clause is correct.
Separating the two independent clauses with a period is grammatically correct. Joining them with a comma creates a comma splice, and using a semicolon after a dependent clause starting with 'which' creates a fragment.
Independent clauses must be separated by a period, a semicolon, or a coordinating conjunction with a comma.

Key Concept

Recognizing and correcting sentence fragments by ensuring clauses have finite verbs, and separating independent clauses with appropriate punctuation.
Estimated Time:1m 0s
Question 62Question →

In 1915, mathematician Emmy Noether formulated a theorem that would fundamentally link symmetry in physics with conservation laws. [1] Although her colleagues, David Hilbert and Felix Klein, recognized the immense value of her work, but they could not secure her a paid position at the University of Göttingen due to institutional prejudices against women.

Which of the following choices best replaces the underlined portion to ensure the sentence is grammatically correct and logically coherent?

Show answer & explanation

Answer: Although her colleagues, David Hilbert and Felix Klein, recognized the immense value of her work, they could not

Answer

The choice that begins with the subordinating conjunction 'Although' and separates the dependent clause from the independent clause with a comma, without using a coordinating conjunction like 'but'.
The correct answer establishes a clear subordinate relationship by using the subordinating conjunction 'Although' at the beginning of the sentence and separating the dependent clause from the main independent clause with a comma, avoiding redundant coordinating conjunctions.

Step-by-Step Solution

1
Identify the relationship between the two clauses: 'her colleagues... recognized the immense value of her work' and 'they could not secure her a paid position'.
The relationship is contrastive, indicating that a subordinating conjunction ('Although') or coordinating conjunction ('but' / 'yet') should connect them, but not both.
Using both a subordinating conjunction and a coordinating conjunction to connect two clauses is grammatically redundant.
2
Analyze the structure of the choices to eliminate ungrammatical options.
The original text contains a double-conjunction error. The option without 'Although' and with a comma creates a comma splice. The option with a semicolon before 'although' creates a fragment.
Independent clauses cannot be joined by a comma alone, and a semicolon cannot separate an independent clause from a dependent clause.
3
Select the grammatically correct option that properly subordinates the first clause.
The correct option starts with 'Although' and uses a comma to connect the dependent clause to the independent clause.
This structure properly subordinates the first clause to the second, creating a coherent complex sentence.

Key Concept

Subordination and Coordination
Estimated Time:1m 0s
Question 63Question →

Which option most effectively coordinates and subordinates the clauses in the passage below to maintain grammatical correctness?

In 1856, teenage chemist William Henry Perkin was attempting to synthesize quinine, a malaria treatment, in his home laboratory. Perkin's experiments did not yield the desired drug, but they resulted in a dark purple residue that became the world's first synthetic dye.

Show answer & explanation

Answer: NO CHANGE

Answer

NO CHANGE
The correct option is grammatically correct because it uses a comma and the coordinating conjunction 'but' to link two independent clauses ('Perkin's experiments did not yield the desired drug' and 'they resulted in a dark purple residue'). The final clause is then properly subordinated as a dependent relative clause starting with 'that' to modify 'residue'.

Step-by-Step Solution

1
Analyze the clause structures in the original sentence.
The clause before the underlined portion ('Perkin's experiments did not yield the desired drug') is an independent clause. The next clause ('they resulted in a dark purple residue') is also an independent clause. The final clause ('became the world's first synthetic dye') is a dependent relative clause modifying 'residue'.
Identifying whether clauses are independent or dependent determines the correct punctuation and conjunctions needed to link them.
2
Determine the correct coordinator for the two main independent clauses.
Since both are independent clauses that present contrasting outcomes, they must be joined either by a semicolon or by a comma followed by a coordinating conjunction (such as 'but'). Using a comma without a conjunction creates a comma splice.
Avoiding run-on sentences and comma splices is essential for proper sentence coordination.
3
Determine the correct subordination for the final modifying clause.
The final clause must be subordinate because it describes the residue. Using a relative pronoun like 'that' or 'which' correctly integrates this information without creating a new independent clause or a fragment.
Proper subordination ensures that modifying information is structurally dependent on the main clause.

Key Concept

Subordination and Coordination
Estimated Time:1m 0s
Question 64Question →

Read the sentence below. What single word must be placed in the blank to ensure the sentence maintains a correct parallel structure?

Fill in the blanks below

The economic report suggested that the country's recovery would depend not only on how quickly the central bank lowered interest rates but also on effectively the government implemented its fiscal stimulus package.
Show answer & explanation

Answer

how
To maintain parallel structure, the two clauses joined by the correlative conjunction 'not only... but also' must share the same grammatical form. The first clause, 'how quickly the central bank lowered interest rates', begins with the adverbial question word 'how' modifying 'quickly'. To match this structure, the second clause, which features the adverb 'effectively', must also begin with the word 'how' to form the parallel clause 'how effectively the government implemented its fiscal stimulus package'.

Step-by-Step Solution

1
Identify the correlative conjunction structure.
The sentence uses the correlative conjunction 'not only... but also...' to connect two parallel elements following the preposition 'on'.
Correlative conjunctions require the structures they connect to be grammatically parallel.
2
Analyze the grammatical structure of the first parallel element.
The phrase following 'not only on' is the noun clause 'how quickly the central bank lowered interest rates', which begins with the adverbial phrase 'how quickly'.
Understanding the exact grammatical form of the first element determines the required form of the second element.
3
Determine the necessary word to make the second element parallel.
The second element is 'but also on [blank] effectively the government implemented...', which contains the adverb 'effectively'. To match the 'how + adverb' pattern of 'how quickly', the blank must be filled with 'how'.
Using 'how' creates the parallel noun clause 'how effectively the government implemented its fiscal stimulus package', matching the structure of the first clause.

Key Concept

Parallelism with Correlative Conjunctions and Dependent Noun Clauses
Estimated Time:1m 30s
Question 65Question →

Fill in the blank in the sentence below with the correct form of the verb 'create' to ensure that the sentence maintains a parallel grammatical structure.

Fill in the blanks below

The board of directors decided not only to increase the annual research budget but also a new oversight committee to monitor expenditures.
Show answer & explanation

Answer

to create
The correct answer is 'to create' because it matches the infinitive form of 'to increase' that directly follows the first part of the correlative conjunction ('not only'). Parallel structure requires that elements joined by 'not only... but also' have identical grammatical forms.

Step-by-Step Solution

1
Identify the correlative conjunction structure in the sentence.
The sentence uses the correlative conjunction pair 'not only... but also' to link two actions.
Parallel structure dictates that elements connected by correlative conjunctions must share the same grammatical form.
2
Analyze the grammatical structure of the first linked element.
The phrase following 'not only' is 'to increase the annual research budget', which is an infinitive phrase.
Establishing the structure of the first element dictates the grammatical requirement for the second element.
3
Format the verb 'create' to match the grammatical structure of the first element.
To parallel the infinitive 'to increase', the verb 'create' must be written in its infinitive form: 'to create'.
Using the infinitive 'to create' balances the sentence and satisfies the parallel structure rule.

Key Concept

Parallel Structure with Correlative Conjunctions
Question 66Question →

The navigation systems of modern commercial aircraft are far more sophisticated than early maritime vessels, which relied primarily on celestial tracking and compasses.

Which of the following alternatives to the underlined portion results in a sentence that is logical and grammatically correct?

Show answer & explanation

Answer: those of early maritime vessels, which relied

Answer

The correct option is the one that changes the underlined portion to 'those of early maritime vessels, which relied'. This makes the comparison logical by comparing 'navigation systems' to 'those' (representing the navigation systems) of early maritime vessels, rather than comparing systems to the vessels themselves.
The correct option makes the comparison logical by using the pronoun 'those' to represent 'navigation systems,' thereby comparing the navigation systems of aircraft to the navigation systems of early maritime vessels rather than comparing systems directly to vessels. It also correctly uses a relative clause starting with 'which' to describe the vessels.

Step-by-Step Solution

1
Identify the two things being compared in the original sentence.
The sentence compares 'navigation systems' (plural noun) with 'early maritime vessels' (plural noun indicating ships).
To determine if the comparison is logical, we must ensure that the sentence compares two items of the same type.
2
Determine the correct structure to make the comparison logical.
The comparison must be between navigation systems and navigation systems. Since 'navigation systems' is plural, the pronoun 'those' should be introduced to refer back to it, resulting in 'those of early maritime vessels'.
Using the pronoun 'those of' establishes a logical and parallel noun-to-noun comparison.
3
Check the remaining clause for grammatical correctness and punctuation.
The clause starting with ', which relied' is a dependent relative clause that correctly modifies 'vessels' and avoids structural errors like comma splices or fragments.
This ensures the entire sentence is grammatically correct and coherent.

Key Concept

Illogical and Incomplete Comparisons
Question 67Question →

Although the mathematician’s groundbreaking theorem solved a century-old paradox, the proof, which relied on complex multidimensional geometry that few of his peers could fully comprehend; and failing to gain immediate acceptance in the wider scientific community.

Which of the following choices is the best revision of the underlined portion of the sentence?

Show answer & explanation

Answer: the proof, which relied on complex multidimensional geometry that few of his peers could fully comprehend, failed

Answer

the proof, which relied on complex multidimensional geometry that few of his peers could fully comprehend, failed
The correct option resolves the sentence fragment by providing the finite verb 'failed' as the predicate for the main subject 'the proof'. This creates a complete independent clause to follow the introductory dependent clause. The parenthetical relative clause starting with 'which' is properly enclosed in commas.

Step-by-Step Solution

1
Analyze the sentence structure of the sentence to locate the main subject and verb of the independent clause.
The sentence begins with a dependent clause introduced by the subordinating conjunction 'Although' ('Although the mathematician’s groundbreaking theorem solved a century-old paradox'). This means the remaining part of the sentence must function as a complete, independent clause.
Every complete sentence containing a dependent clause must also contain at least one independent clause with a subject and a finite verb.
2
Evaluate the underlined portion to see if it provides a complete independent clause.
The subject is 'the proof', followed by a relative clause 'which relied...'. The rest of the underlined portion is '; and failing'. Semicolons must separate independent clauses, but 'and failing...' is not independent. Furthermore, 'failing' is a non-finite participle, meaning the subject 'the proof' lacks a finite main verb to complete its clause.
To identify if a clause is a fragment, verify that it has a subject and a verb that can express a complete tense and thought.
3
Evaluate the choices to find the one that provides a grammatically complete main clause without introducing other errors.
The choice replacing the semicolon and participle with a comma and the finite verb 'failed' successfully provides a main verb for the subject 'the proof', resolving the fragment. The choice using a comma followed by 'it failed' creates a comma splice. The choice using two participle phrases keeps the clause as a fragment.
The correct choice must establish a subject-verb pair for the independent clause while avoiding punctuation errors like comma splices.

Key Concept

Sentence Fragments
Question 68Question →

In 1967, astrophysicist Jocelyn Bell Burnell detected a series of highly regular radio pulses while analyzing chart recorder data. Although she jokingly labeled the initial signals "LGM-1" (for 'Little Green Men') to acknowledge their seemingly artificial origin. She and her advisor soon realized the pulses were coming from a rapidly spinning neutron star.

Which choice best corrects the underlined portion?

Show answer & explanation

Answer: Although she jokingly labeled the initial signals "LGM-1" (for 'Little Green Men') to acknowledge their seemingly artificial origin, she and her advisor

Answer

The choice that connects the introductory dependent clause with the independent clause using a comma: 'Although she jokingly labeled the initial signals "LGM-1" (for 'Little Green Men') to acknowledge their seemingly artificial origin, she and her advisor'
The correct option properly uses a comma to connect the introductory dependent clause (which starts with 'Although') to the main independent clause. This forms a single, grammatically complete sentence.

Step-by-Step Solution

1
Analyze the clause structure around the underlined portion to determine if the sentences are complete.
The clause starting with 'Although' is a dependent clause because 'Although' is a subordinating conjunction. The subsequent clause 'She and her advisor soon realized...' is independent.
Identifying the clause type helps determine the correct punctuation required to connect them.
2
Select the correct punctuation to join the dependent clause to the independent clause.
When a dependent clause introduces a sentence, it must be followed by a comma before the independent clause begins.
Using a period or semicolon creates a sentence fragment since a dependent clause cannot stand alone.
3
Compare the options to find the one that uses a comma without introducing other errors.
The option using a comma correctly connects the clauses, while the option removing 'Although' and using a comma creates a comma splice.
This ensures the final sentence is grammatically correct and cohesive.

Key Concept

Sentence fragments and subordinating conjunctions
Estimated Time:45s
Question 69Question →

Arrange the sentence segments to construct a grammatically correct sentence that maintains parallel structure.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence is 'The software development team was responsible', followed by 'not only for designing the database', and ending with 'but also for testing the user interface.'
The correct sequence begins with the main clause 'The software development team was responsible', is followed by the first correlative element 'not only for designing the database', and concludes with the matching parallel element 'but also for testing the user interface.' This maintains parallel structure because both parts of the correlative conjunction ('not only' and 'but also') are followed by prepositional phrases starting with the preposition 'for' and a gerund ('designing' and 'testing').

Step-by-Step Solution

1
Identify the main independent clause that introduces the subject and predicate of the sentence.
'The software development team was responsible'
A grammatically complete sentence must begin with an independent clause containing a subject and a verb before introducing parallel list items.
2
Locate the first part of the correlative conjunction structure and its grammatical form.
'not only for designing the database'
The phrase 'not only' introduces the first element of the correlative pair, which is formatted as a prepositional phrase with a gerund ('for designing').
3
Identify the second part of the correlative structure that matches the grammatical form of the first element.
'but also for testing the user interface.'
To maintain parallel structure, 'but also' must be followed by a prepositional phrase with a gerund ('for testing') that matches the structure of the first element.

Key Concept

Parallel structure requires that correlative conjunctions (like 'not only... but also') connect grammatically identical elements, such as parallel prepositional gerund phrases.
Question 70Question →

The defense mechanisms of the mimic octopus, which include shape-shifting and color-matching to deter predators, are far more sophisticated than a cuttlefish, which relies on simple camouflage.

Which choice most effectively and logically completes the comparison in the sentence?

Show answer & explanation

Answer: those of the cuttlefish, which relies on simple camouflage

Answer

The correct answer is the option that states 'those of the cuttlefish, which relies on simple camouflage', as it correctly compares the plural 'defense mechanisms' to the plural pronoun 'those' of the cuttlefish, and properly sets off the descriptive clause with a comma.
The correct option correctly resolves the comparison error by introducing the plural pronoun 'those of' to refer to 'defense mechanisms', ensuring that the mechanisms of the mimic octopus are logically compared to the mechanisms of the cuttlefish. It also correctly uses a comma to set off the nonessential clause 'which relies on simple camouflage'.

Step-by-Step Solution

1
Identify the elements being compared in the sentence.
The sentence attempts to compare the 'defense mechanisms' of the mimic octopus to a cuttlefish.
To make a comparison logical, the two items compared must be of the same category (e.g., comparing features to features rather than features to an entire organism).
2
Determine if the original comparison is logical and identify the grammatical number of the target noun.
Comparing 'mechanisms' (plural) to 'a cuttlefish' (singular animal) is illogical. The target noun 'mechanisms' is plural.
Since 'mechanisms' is plural, any pronoun replacing it in the comparison must also be plural ('those').
3
Evaluate the choices for logical pronoun use and correct punctuation.
The option using 'those' and a comma correctly forms the plural comparison and joins the nonessential clause. The option using a semicolon incorrectly separates a dependent clause, and the option using 'that' uses an incorrect singular pronoun.
Standard English grammar requires nonessential relative clauses beginning with 'which' to be set off by a comma, not a semicolon.

Key Concept

Logical comparisons require that the items being compared are grammatically parallel and of the same category. For plural nouns, use the plural pronoun 'those of' rather than the singular 'that of' or the bare noun of a different class.
Estimated Time:1m 0s
Question 71Question →

In the context of the passage below, which of the following choices is the best revision of the underlined portion?

The Cassini spacecraft was launched to study Saturn and its moons in 1997. Although it did not reach the planet until 2004.

Show answer & explanation

Answer: 1997, although it did not reach

Answer

The correct answer is the option that replaces the period with a comma to join the dependent clause to the preceding independent clause.
The correct option replaces the period with a comma, which properly connects the dependent clause starting with the subordinating conjunction 'although' to the preceding independent clause.

Step-by-Step Solution

1
Analyze the structure of the clauses in the passage.
The clause 'The Cassini spacecraft was launched to study Saturn and its moons in 1997' is independent. The clause 'Although it did not reach the planet until 2004' is dependent because it begins with the subordinating conjunction 'Although'.
Understanding clause types is necessary to identify sentence fragments.
2
Evaluate the grammar of the original sentence.
A dependent clause cannot stand alone as a sentence. Thus, the original phrasing contains a sentence fragment.
This confirms that a revision is required, ruling out the option to make no change.
3
Compare the remaining options to find the correct punctuation.
A comma is the correct punctuation to join an introductory or trailing dependent clause to an independent clause. A semicolon creates a fragment because the second clause is dependent, and removing the subordinating conjunction while keeping only a comma creates a comma splice.
This ensures the final sentence is grammatically correct and complete.

Key Concept

A dependent clause starting with a subordinating conjunction must be joined to an independent clause with appropriate punctuation, rather than standing alone as a sentence fragment.
Estimated Time:45s
Question 72Question →

The plumage of the male wood duck is much more colorful than the female wood duck, which has dull brown feathers for camouflage. Which of the following options is the best replacement for the underlined portion of the sentence?

Show answer & explanation

Answer: that of the female wood duck, which

Answer

The correct answer is the option that replaces the underlined text with 'that of the female wood duck, which' because it compares the plumage of the male wood duck to the plumage of the female wood duck.
The correct answer correctly uses the pronoun 'that' to refer back to 'plumage,' establishing a logical comparison between the plumage of the male wood duck and the plumage of the female wood duck.

Step-by-Step Solution

1
Identify the two elements being compared in the sentence.
The sentence attempts to compare 'The plumage of the male wood duck' with 'the female wood duck'.
To ensure the comparison is logical, the items being compared must be of the same type (plumage to plumage, rather than plumage to duck).
2
Select the option that corrects this illogical comparison and maintains proper punctuation.
Using 'that of the female wood duck' inserts the singular pronoun 'that' to represent 'the plumage', making the comparison logical.
This establishes a grammatically correct and logical parallel comparison without creating punctuation errors like fragments or comma splices.

Key Concept

Illogical comparisons occur when a sentence compares two things that are not of the same type, such as comparing a characteristic of an animal to the animal itself.
Estimated Time:40s
Question 73Question →

Consider the following excerpt from a passage about the history of computing:

"In the mid-twentieth century, early computers were massive machines that filled entire rooms, modern microprocessors allow us to carry equivalent computing power in our pockets."

Which of the following is the most grammatically correct replacement for the underlined portion?

Show answer & explanation

Answer: rooms, but modern microprocessors

Answer

rooms, but modern microprocessors
The correct answer is the option that inserts the coordinating conjunction 'but' after the comma. This correctly connects the two independent clauses while showing the contrast between them.

Step-by-Step Solution

1
Analyze the two clauses in the sentence to determine if they are independent or dependent.
The first clause ('early computers were massive machines that filled entire rooms') and the second clause ('modern microprocessors allow us to carry equivalent computing power in our pockets') are both independent clauses because they can each stand alone as a complete sentence.
Identifying the clause type is necessary to apply correct punctuation and conjunction rules.
2
Select the appropriate punctuation and conjunction to link these clauses grammatically.
To join two independent clauses, a coordinating conjunction (such as 'but') preceded by a comma is required. Subordinating conjunctions or relative pronouns would turn the second clause into a fragment.
A coordinating conjunction like 'but' properly connects two complete thoughts while highlighting the contrast between past and present technology.

Key Concept

Two independent clauses must be joined using a semicolon or a comma followed by a coordinating conjunction (FANBOYS: for, and, nor, but, or, yet, so). Using a comma alone results in a comma splice, while introducing a subordinating conjunction after a semicolon results in a fragment.
Estimated Time:45s
Question 74Question →

The acoustic resonance of the newly renovated concert hall in Vienna is far more pronounced than most modern auditoriums, which often rely on electronic amplification to project sound clearly.

Which of the following choices best completes the sentence to ensure the comparison is logical and grammatically correct?

Show answer & explanation

Answer: that of most modern auditoriums, which

Answer

The choice that reads 'that of most modern auditoriums, which' is correct because the singular pronoun 'that' correctly and logically refers back to the singular noun 'acoustic resonance' of the concert hall.
The correct choice is the one that states 'that of most modern auditoriums, which'. This option correctly uses the singular pronoun 'that' to refer to 'acoustic resonance', which resolves the illogical comparison by comparing the resonance of the Vienna hall to the resonance of modern auditoriums.

Step-by-Step Solution

1
Identify the noun being compared and determine if it is singular or plural.
The noun is 'acoustic resonance', which is singular.
To make a logical comparison, the pronoun replacing it or the structure referring to it must match in grammatical number.
2
Identify the entity to which it is compared.
The original sentence compares 'acoustic resonance' to 'most modern auditoriums' (physical buildings).
A property of a building cannot be logically compared to the building itself.
3
Select the replacement that introduces a matching singular pronoun to represent the compared property.
The pronoun 'that' is singular and refers to 'acoustic resonance', whereas 'those' is plural.
The correct choice must use 'that of' and avoid punctuation errors like a semicolon splice.

Key Concept

Illogical comparisons occur when a sentence compares two items that are not of the same type. In ACT English, this error is corrected by inserting singular ('that of') or plural ('those of') pronouns to make the comparison parallel and logical.
Question 75Question →

The following passage contains an underlined portion.

Archivists working to preserve early wax cylinder audio recordings face unique chemical challenges. Because the organic compounds in the wax degrade when exposed to fluctuating humidity; they must store the cylinders in climate-controlled vaults.

Which of the following choices best corrects the underlined portion to make the sentence grammatically correct?

Show answer & explanation

Answer: Because the organic compounds in the wax degrade when exposed to fluctuating humidity, they must store

Answer

Because the organic compounds in the wax degrade when exposed to fluctuating humidity, they must store
The correct answer properly repairs the sentence structure by replacing the semicolon with a comma. Since the sentence begins with the subordinating conjunction 'Because', the first clause is dependent and must be joined to the main independent clause using a comma.

Step-by-Step Solution

1
Identify the grammatical components of the sentence.
The clause starting with 'Because' is a dependent clause that cannot stand alone as a complete sentence, while the clause starting with 'they must store' is an independent clause.
Understanding the structure of the clauses helps determine the appropriate punctuation needed to connect them.
2
Evaluate the punctuation separating the two clauses.
The original text uses a semicolon. Semicolons are used to separate two independent clauses, not a dependent clause and an independent clause.
Using a semicolon after a dependent clause creates a fragment, which is grammatically incorrect.
3
Select the punctuation that correctly connects an introductory dependent clause to an independent clause.
A comma is the correct punctuation mark to place after an introductory dependent clause before the main clause begins.
This establishes a clear relationship between the cause and effect while maintaining sentence completeness and avoiding fragments or comma splices.

Key Concept

Identifying and correcting sentence fragments caused by improper punctuation or dangling dependent clauses.
Estimated Time:1m 0s
Question 76Question →

Read the sentence below and analyze the underlined portion:

Because the red panda shares several anatomical features with both raccoons and bears. Scientists struggled for decades to classify it.

Which of the following choices is the best revision of the underlined portion?

Show answer & explanation

Answer: Because the red panda shares several anatomical features with both raccoons and bears, scientists

Answer

The option that connects the introductory dependent clause to the main clause using a comma: 'Because the red panda shares several anatomical features with both raccoons and bears, scientists'
The correct option connects the dependent introductory clause to the independent main clause using a comma. The word 'Because' introduces a dependent clause, which cannot stand alone as a complete sentence. By placing a comma after 'bears' and changing the capitalized 'Scientists' to lowercase, the fragment is resolved.

Step-by-Step Solution

1
Identify the grammatical nature of the opening clause beginning with 'Because'.
The clause 'Because the red panda shares several anatomical features with both raccoons and bears' is a dependent clause because it starts with a subordinating conjunction.
A dependent clause contains a subject and a verb but does not express a complete thought, meaning it cannot stand alone as a sentence.
2
Determine how to connect this dependent clause to the main clause 'scientists struggled for decades to classify it'.
An introductory dependent clause must be followed by a comma before the main clause begins.
Using a period or a semicolon creates a fragment, whereas removing the subordinating conjunction entirely while keeping only a comma results in a comma splice.

Key Concept

Identifying and correcting sentence fragments caused by dependent clauses
Estimated Time:45s
Question 77Question →

The acoustic properties of the new concert hall are far more balanced than the old theater, which suffered from excessive echo and sound distortion. Which option makes the underlined portion of the sentence logically and grammatically correct?

Show answer & explanation

Answer: those of the old theater, which suffered

Answer

The choice that states 'those of the old theater, which suffered' makes the comparison logical and is grammatically correct.
The choice that states 'those of the old theater, which suffered' is correct because it uses the plural pronoun 'those' to represent 'acoustic properties,' establishing a clear and logical comparison. It also correctly uses a comma to set off the nonessential relative clause.

Step-by-Step Solution

1
Identify the elements being compared in the sentence.
The sentence attempts to compare 'The acoustic properties of the new concert hall' to 'the old theater'.
A logical comparison must compare similar things. Here, a property of a building is incorrectly compared directly to a building.
2
Choose the pronoun that correctly replaces the noun phrase to make the comparison logical.
Since 'properties' is plural, the plural pronoun 'those' must be used: 'those of the old theater'.
This makes the sentence compare the acoustic properties of the new concert hall to the acoustic properties (those) of the old theater.
3
Ensure proper punctuation and clause structure.
The dependent clause starting with 'which' must be separated by a comma, not a semicolon, as it is nonessential.
A semicolon cannot separate a dependent clause from an independent clause.

Key Concept

Illogical and Incomplete Comparisons
Estimated Time:45s
Question 78Question →

In the sentence below, which choice best corrects the underlined comparison?

The vocal ranges of opera singers are typically much wider than pop singers, who often rely on amplification to project their voices.

Show answer & explanation

Answer: those of pop singers, who often rely

Answer

The correct answer is the option that replaces the underlined text with 'those of pop singers, who often rely'. This correctly compares the vocal ranges of opera singers with 'those' (the vocal ranges) of pop singers, establishing a logical comparison.
The correct answer correctly uses the pronoun 'those' to refer back to 'the vocal ranges,' ensuring a logical and parallel comparison between the ranges of opera singers and the ranges of pop singers. Additionally, it properly uses a comma before the relative clause 'who often rely' to provide nonessential information about pop singers.

Step-by-Step Solution

1
Identify the two elements being compared in the sentence.
The sentence attempts to compare 'the vocal ranges of opera singers' to 'pop singers'.
A logical comparison must compare similar things: in this case, the vocal ranges of one group must be compared to the vocal ranges of the other group, not to the people themselves.
2
Select the option that corrects this illogical comparison while maintaining proper punctuation.
The phrase 'those of pop singers' uses the plural pronoun 'those' to refer to 'vocal ranges,' creating a logical noun-to-noun comparison, and it is punctuated correctly with a comma before the dependent clause.
This satisfies both the logic of the comparison and the rules of punctuation.

Key Concept

Illogical comparisons occur when a sentence compares two things that cannot be logically compared, such as comparing a characteristic of one group (vocal ranges) directly to the members of another group (pop singers) instead of their characteristics. Using relative pronouns like 'that of' (singular) or 'those of' (plural) corrects this error.
Question 79Question →

In 1938, physicist Lise Meitner fled Nazi Germany for Sweden, where she continued her collaboration with chemist Otto Hahn. Hahn had observed that bombarding uranium with neutrons produced barium. Although he was unable to explain this result; it was Meitner who subsequently calculated that the uranium atom had actually split, releasing vast amounts of energy. Which choice is the best replacement for the underlined portion of the sentence?

Show answer & explanation

Answer: Although he was unable to explain this result, Meitner subsequently calculated

Answer

The correct option is the one that begins with the subordinating conjunction 'Although' and uses a comma to connect the dependent clause to the main clause.
The correct option correctly uses the subordinating conjunction 'Although' to establish a dependent clause ('Although he was unable to explain this result'), which is separated by a comma from the independent main clause ('Meitner subsequently calculated that the uranium atom had actually split'). This structure properly links the two ideas and shows their contrasting relationship.

Step-by-Step Solution

1
Analyze the structure of the original sentence to identify the clauses and punctuation.
The clause beginning with 'Although' is a dependent clause, but it is followed by a semicolon and then an independent clause.
A semicolon can only connect two independent clauses, so using one after a dependent clause is incorrect.
2
Evaluate the grammar and connection of the options.
The option that changes the participle 'calculated' to 'calculating' creates a sentence fragment. The option that removes the subordinating conjunction entirely and joins the two clauses with a comma creates a comma splice.
Correct subordination requires an introductory subordinating conjunction followed by a comma and a main independent clause containing a finite verb.
3
Select the option that properly subordinates the first clause to the second while keeping both structurally complete.
The option starting with 'Although' and ending with 'subsequently calculated' forms a grammatically correct complex sentence.
It uses a comma to separate the introductory dependent clause from the complete main clause.

Key Concept

Subordination and Coordination
Question 80Question →

To evaluate the environmental impact of the new highway, the engineering firm measured local air quality, surveyed local wildlife populations, and they also analyzed runoff samples from nearby streams.

Which choice best maintains the parallel structure of the sentence?

Show answer & explanation

Answer: analyzed runoff samples from nearby streams

Answer

The correct choice is 'analyzed runoff samples from nearby streams', as it uses a past-tense verb phrase that is parallel to the preceding items in the series.
The correct choice, 'analyzed runoff samples from nearby streams', uses a simple past-tense verb followed by its direct object and a modifying prepositional phrase. This matches the grammatical structure of the first two items in the list ('measured local air quality' and 'surveyed local wildlife populations'), thereby maintaining parallel structure.

Step-by-Step Solution

1
Identify the items in the list or series within the sentence.
The list consists of three actions performed by the engineering firm: 'measured local air quality', 'surveyed local wildlife populations', and the underlined portion.
Recognizing the structure of the list establishes the pattern that must be maintained.
2
Analyze the grammatical structure of the first two items in the series.
Both 'measured local air quality' and 'surveyed local wildlife populations' are past-tense verb phrases (verb + direct object + prepositional modifier).
This establishes that the third item must also be a past-tense verb phrase to maintain parallel structure.
3
Evaluate the choices to find the one that maintains this past-tense verb phrase structure.
The choice 'analyzed runoff samples from nearby streams' matches this pattern exactly, while the other choices introduce pronouns, shifting verb forms, or comma splices.
Selecting the parallel structure ensures grammatical consistency and correctness.

Key Concept

Parallel structure requires that items in a series or list follow the same grammatical pattern (noun with noun, verb with verb, etc.) to ensure clarity and balance.
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