Biomolecules - Result Question 54
####54. Which of the following is correct about $H-$ bonding in nu cleotide?
[2001]
(a) $A$— $A$ and $T$— $T$
(b) $G–T$ and $A–C$
(c) $A—G$ and $T–C$
(d) A— $T$ and $G–C$
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Solution:
- (d)
The hydrogen bonds are formed between the base (shown by dotted lines). Because of size and geometrics of the bases, the only possible pairing in DNA are between $G$ (Guanine) and $C$ (Cytosine) through three $H$-bonds and between $A$ (Adenosine) and $T$ (Thymine) through two H-bonds.
