If a structural gene in an organism's genome is comprised of 29% guanine nucleotides, what...
BIOLOGY
SAT 2021
If a structural gene in an organism's genome is comprised of 29% guanine nucleotides, what percentage of the gene is comprised of cytosine nucleotides?
- A. 42%
- B. 29%
- C. It cannot be determined from the given information.
- D. 19%
Correct Answer: B. 29%
Explanation
This question is designed to catch a) students who are not reading the question carefully, and b) students unsure of which nucleotides pair with which. The correct answer is 29%, because cytosine pairs with guanine in a 1:1 ratio. If you answered 21%, then you likely thought the question was more complex than it was.
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