Question

In a DNA molecule, is the number of guanine equal with the number of cytosine? Why?
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Answer 1

Answer:

Are there always going to be an EQUAL number of guanine and cytosine molecules in a molecule of DNA? Yes, because guanine can only pair with cytosine, according to Chargaff's Rule.

Explanation:

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Answer 2

Answer:

According to Chargraff's rule, Number of purine (adenine+guanine) = Number of pyrimidine (cytosine+thymine).

Hence, the amount of guanine should be equal to cytosine and the amount of adenine should be equal to thymine.

As per the data given above, we can infer that, the percentage of G = the percentage of C = 18%.

Now, total percentage of total A and T = 100 - 18 - 18 = 64, so the percentage of A is 64/2 = 32%.

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