If there are 120 adenine molecules in a B-DNA double helical structure showing 20 coils, what is the number of pyrimidine nucleotides forming three hydrogen bonds in it?

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100

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120

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140

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Solution

The correct option is A 80
B-DNA contains approximately 10 base pairs per coil, so 20 coils contain 200 base pairs. 120 adenine molecules correspond to 120 A-T base pairs. Number of G-C base pairs is 200-120=80.
Pyrimidine nucleotide forming 3 hydrogen bonds is cytidine monophosphate, so number of cytosine molecules is 80.

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