If 35 percent of a double-stranded DNA sample is adenine, what percent is cytosine?

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Multiple Choice

If 35 percent of a double-stranded DNA sample is adenine, what percent is cytosine?

Explanation:
In double-stranded DNA, base pairing keeps A and T in equal amounts and C and G in equal amounts. If adenine is thirty-five percent, thymine must also be thirty-five percent, so A plus T accounts for seventy percent of the bases. The remaining thirty percent must be split equally between cytosine and guanine, since C pairs with G. Half of thirty percent is fifteen percent, so cytosine is fifteen percent.

In double-stranded DNA, base pairing keeps A and T in equal amounts and C and G in equal amounts. If adenine is thirty-five percent, thymine must also be thirty-five percent, so A plus T accounts for seventy percent of the bases. The remaining thirty percent must be split equally between cytosine and guanine, since C pairs with G. Half of thirty percent is fifteen percent, so cytosine is fifteen percent.

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