MCAT Biochemistry Question 97: Answer and Explanation
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Question: 97
7. A double-stranded RNA genome isolated from a virus was found to contain 15% uracil. What percentage of guanine should exist in this virus's genome?
- A. 15%
- B. 35%
- C. 70%
- D. 85%
Correct Answer: B
Explanation:
The percentage of uracil must equal that of adenine due to base-pairing. This accounts for 30% of the genome. The remaining 70% must be split evenly between guanine and cytosine, so they each account for 35% of the genome.