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Question

On an average how many purine N2 bases are present in single coil of DNA

A
4
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B
5
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C
10
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D
Uncertain
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Solution

The correct option is A 5
By Chargaff's Rule, we know that in a DNA,
Purine = Pyrimidines
and talking about the DNA - most common B-DNA consist of 10 base pairs per turn of the helix which explains that 5 Purines and 5 Pyrimidines will be present per coil of a DNA.
So, the correct answer to the question is '5'.

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