If thymine is 30%, what percent adenine would the DNA contain?

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Multiple Choice

If thymine is 30%, what percent adenine would the DNA contain?

Explanation:
In double-stranded DNA, adenine pairs with thymine, and cytosine pairs with guanine. Because the two bases in each pair occur in equal amounts, A and T are always equal. If thymine is 30%, adenine must also be 30%. The remaining bases (cytosine and guanine) make up 40% together and are equal, so each is 20%. This shows why adenine is 30% in this scenario.

In double-stranded DNA, adenine pairs with thymine, and cytosine pairs with guanine. Because the two bases in each pair occur in equal amounts, A and T are always equal. If thymine is 30%, adenine must also be 30%. The remaining bases (cytosine and guanine) make up 40% together and are equal, so each is 20%. This shows why adenine is 30% in this scenario.

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