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Difficulty: MediumClause Boundaries and Linking

In the high-altitude deserts of the Andes Mountains, specialized extremophile bacteria thrive under intense ultraviolet radiation that would normally be lethal to most organisms. To survive in this incredibly harsh environment, the microbes produce protective carotenoids ______ these vibrant organic pigments shield their delicate cellular structures from severe solar damage. Which choice completes the text so that it conforms to the conventions of Standard English?

  1. A
    carotenoids
  2. B
    carotenoids, but
  3. carotenoids;Answer
  4. D
    carotenoids,

Answer

The choice ending with a semicolon properly links the two independent clauses.
The correct option uses a semicolon to separate two independent clauses: 'To survive in this incredibly harsh environment, the microbes produce protective carotenoids' and 'these vibrant organic pigments shield their delicate cellular structures from severe solar damage.' Using a semicolon is a grammatically correct way to link two closely related independent clauses without a coordinating conjunction.

Step-by-Step Solution

1
Identify the clause boundaries by analyzing the sentence structure around the blank.
The text before the blank ('To survive in this incredibly harsh environment, the microbes produce protective carotenoids') is an independent clause. The text after the blank ('these vibrant organic pigments shield their delicate cellular structures from severe solar damage') is also an independent clause.
Understanding whether the clauses are independent or dependent determines the type of punctuation or conjunction needed to connect them.
2
Evaluate the relationship between the two independent clauses to determine if a coordinating conjunction is appropriate.
The second clause explains how the carotenoids help the bacteria survive. There is no contrast between the two ideas, so a contrasting coordinator is incorrect.
This helps eliminate choices that introduce inappropriate transition words.
3
Select the punctuation mark that conforms to standard English conventions for linking two independent clauses without a coordinating conjunction.
A semicolon is a standard way to link two independent clauses.
This ensures the final sentence is grammatically correct and free of comma splices or run-on errors.

Key Concept

Clause Boundaries and Linking
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Topics

Clause Boundaries and Linking

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