SAT Subject Biology Practice Question 252: Answer and Explanation

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Question: 252

2. Which of the following is generally identical in all the somatic cells of an organism?

I. DNA sequences

II. Protein structures

III. RNA sequences

A. I only
B. II only
C. III only
D. I and II
E. I and III

Correct Answer: A


Nearly all the somatic cells of an individual share the same DNA, carrying the same genetic information. Because different genes are expressed in different cell types, different RNA sequences and proteins are produced.

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