PSAT Reading Question 498: Answer and Explanation

Question: 498

As used in line 27, "peculiar" most closely means

• A. strange.
• B. unique.
• C. diseased.
• D. helpful.

Correct Answer: B

Explanation:

(B) Consider the context. These lines state that peptidoglycan polymers are highly peculiar to bacteria and that the antimicrobial agents that target peptidoglycan don't harm other cells. In other words, only bacteria are affected by these agents because only bacteria have peptidoglycan polymers. Therefore, the polymers are unique to bacteria, choice (B). Choice (A) is another common use of the word "peculiar." In this case, though, it is somewhat opposite of what the author means since peptidoglycans are common to bacteria. Choice (C) is wrong because these polymers are normal, not diseased. Choice (D) is wrong because although peptidoglycans certainly are helpful, this doesn't fit the contrast in the latter part of the sentence.