Question

Which of the following is correct about H-bonding in
nucleotide?
(a) A --- A and T --- T (b) G --- T and A --- C
(c) A --- G and T --- C (d) A --- T and G --- C

Answer 1

The following is correct about H-bonding in

nucleotide: A --- T and G --- C

-The structure of the DNA molecule is like a double helix structure

-In this structure, double helix is made up of chains of polynucleotide that are held together by H-bonds

-In these helix, four bases are present namely adenine (A), cytosine (C), guanine (G) and thymine (T)

- In these helix, the adenine (A) base is linked with thymine (T) by two H-bonds as A≡T and guanine (G) is joined with cytosine (C) by three H-bonds as G≡C

- So the correct answer is option (d)