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NEET Biology question

BiologyMolecular Basis of InheritanceNEET

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?

Answer: (A)

Solution

B-DNA has 10 bp per turn, so 20 coils = 200 bp = 400 bases total. A = T = 120 each, so G + C = 400 − 240 = 160, giving G = C =

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Question ID VK-111520