SAT Subject Biology Practice Question 14: Answer and Explanation

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Question: 14

5. Which of these labels matches the structure of the partial RNA strand shown?

A. I. phosphate; II. ribose; III. nitrogen base
B. I. phosphate; II. nitrogen base; III. ribose
C. I. nitrogen base; II. phosphate; III. ribose
D. I. ribose; II. nitrogen base; III. phosphate
E. I. ribose; II. phosphate; III. nitrogen base

Correct Answer: A


The five-carbon ribose sugar (II) and the phosphate group (I) make up the backbone of the RNA strand. The nitrogen bases (III) are attached to the ribose sugars.

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