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In sea urchin DNA, which is double stranded, 17% of the bases were shown to be cytosine. The percentages of the other three bases expected to be present in this DNA are:

1. 17% A, 16.5% T, 32.5%
2. 17% A, 33%, T 33%
3. 8.5% A, 50% T, 24.5%
4. 34% A, 24.5%, T 24.5%

Correct answer: 17% A, 33%, T 33%

Solution

In double-stranded DNA, cytosine pairs with guanine, so %C = %G = 17%. That leaves 66% for adenine and thymine, which must be equal, so each is 33%.

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