If DNA molecules found to be composed of 30% guanine what percentage would there be of cytosine?

It would be20% plus 20% is 40% of adennine and thymine.

Explanation:

If given the information that the sample is 20 percent guanine,, then you can surmise it is also 20 percent cytosine since guanine and cytosine pair with each other.

littering streams           is the answer

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