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Suppose that 4000 base molecules are present in a certain DNA, 30% are adenine. how many will be guanine?

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Adenine pairs with thymine. So 30% of base molecules are adenine, and another 30% are thymine. The remaining are split equally between guanine and cytosine.

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2800

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at least can you tell me how?
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Assuming there is a four-way even split of the 4000 molecules that make up the DNA into guanine, thymine, cytosine and adenine, then there are 1000 guanine molecules. Guanine is a key component of both RNA and DNA according to http://www.thefreedictionary.com/guanine.

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