A sample of DNA is sequenced and found to contain 34% guanine. What percentage of
BIOLOGY
SAT 2021
A sample of DNA is sequenced and found to contain 34% guanine. What percentage of thymine does it contain?
- A. 32%
- B. 0%
- C. 17%
- D. 16%
Correct Answer: D. 16%
Explanation
In DNA, guanine pairs with cytosine and adenine pairs with thymine. In RNA, which does not have thymine, adenine pairs with uracil. Thus, if a sample contains 34% guanine, it also contains 34% cytosine. Together, the two make up 68% of the 100% total. The remaining 32% is divided evenly between the paired adenine and thymine molecules, so the DNA sample contains 16% percent each of adenine and thymine. 16% is the correct answer.
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