How many hydrogen bonds are required to form bonding between adenine and thymine?

Q. How many hydrogen bonds are required to form bonding between adenine and thymine?

A

1

B

2

C

3

D

Not fixed

Solution:

Base pairing between adenine and thymine can be found in DNA only.
There are two hydrogen bonds holding the two nitrogenous bases together.
One of the hydrogen bonds is formed between one of the Hydrogen atoms of the amino group at C-6 of adenine and the Oxygen atom of the keto group at C-4 of thymine.

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