The following explains answers to Test Yourself: "That" vs. "Which"

Correct!

Sentence 1

The data that that we gathered from the experiment were conclusive.

Explanation

In this sentence, the clause "that we gathered from the experiment" is essential. Without this clause, the sentence would be "The data were conclusive." Although this short sentence is grammatically correct, the meaning of the original is lost. Thus, because this clause is essential, it requires the relative pronoun "that" and needs no punctuation.

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The following explains answers to Test Yourself: "That" vs. "Which"

Correct!

Sentence 2

A new treatment for AIDS combines three drugs, which include a protease inhibitor.

Explanation

The sentence would be clear without this clause. The clause is merely descriptive, indicating that one of the three drugs includes a protease inhibitor. It is therefore non-essential. The clause requires the use of the pronoun "which" and is punctuated with a comma.

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The following explains answers to Test Yourself: "That" vs. "Which"

Correct!

Sentence 3

Fluconazole, which is an imidazole, is now considered primary treatment for cryptococcal meningitis.

Explanation

If this clause were removed, the sentence would still be clear. The clause is descriptive, indicating what type of drug fluconazole is. It is therefore non-essential.The clause requires the use of the pronoun "which" and is punctuated with paired commas.

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The following explains answers to Test Yourself: "That" vs. "Which"

Correct!

Sentence 4

Substrate B, which can be purchased in large quantities, is used in the production of raziline.

Explanation

The sentence would be clear without this clause. The clause is descriptive, indicating that substrate B can be purchased in large quantities. It is therefore non-essential. The clause requires the use of the pronoun "which" and is punctuated with paired commas.

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