Question

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

• A. 4
• B. 5
• C. 10
• D. Uncertain

Answer 1

Answer: (B)

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'.