Which of the following feature is not correct about DNA str…

Chemistry NEET Full Syllabus Mock Test 180 Question New Syllabus Mock Test - 8 PCB Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 12, 2026

Which of the following feature is not correct about DNA structure?

Backbone is constituted by sugar-phosphate, and the bases project inside.

There two hydrogen bonds between Adenine and thymine while three hydrogen bonds between guanine and cytosine.

A pitch of the helix contain 10 base pairs is 0.34 nm.

The plane of one base pair stack over the other in double helix confers stability of the helical structure.

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The correct answer is:

The pitch of the helix is 3.4 nm (a nanometer is one billionth of a meter, that is ) and there are roughly 10 bp in each turn. Consequently, the distance between a bp in a helix is approximately 0.34 nm.

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