MCAT Biology Question 3: Answer and Explanation
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Question: 3
3. Which of the following types of nucleic acid could form the genome of a virus?
I. Single-stranded RNA
II. Double-stranded DNA
III. Single-stranded DNA
- A. I only
- B. II only
- C. I and II only
- D. I, II, and III
Correct Answer: D
Explanation:
In a virus, the nucleic acid can be either DNA or RNA and—in both cases—can be either single- or double-stranded. Therefore, all of the types of nucleic acids listed here could be used for a viral genome, making choice (D) the correct answer.