Question

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

Answer 1

80 pyrimidines nucleotide

Answer 2

Correct Answer is Option A:80. B-DNA shows 10 nucleotides per turn of the helix coil.

As there are 20 coils, total number nucleotides are 200 of which 120 are adenine (given) which has an equal amount of cytosine, nucleotides are 80.

Three hydrogen bonds exist between guanine and cytosine.