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Thymine binds to adenine, so we know that for every thymine, there will be one adenine. That's 15% thymine and 15% adenine. We are left with 70% other nitrogen bases. There are two bases left (guanine and cytosine), both of which bond together in equal numbers. So 70 divided by 2 is 35 -- 35% guanine and 35% cytosine.

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13y ago
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14y ago

35%

if 15% is thymine, 15% must adenine

therefore 70% is cytosine and guanine

divided by 2 = 35% cytosine

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6y ago

They should be the same if there are no mutations.

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12y ago

35%

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13y ago

35%

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13y ago

20%

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Q: If 15 percent of the nitrogenous base in a sample of DNA is thymine what percentage should be cytosine?
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