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  4. The fact that a purine base always paired through hydrogen bonds with a pyrimidine base leads to, in the DNA double helix

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Q. The fact that a purine base always paired through hydrogen bonds with a pyrimidine base leads to, in the $DNA$ double helix

Molecular Basis of Inheritance

Solution:

Since specific and different nitrogen bases occur on the two $DNA$ chain, the latter are complementary. It is because of specific base pairing with a purine lying opposite to a pyrimidine. This makes the two chains $2$ nm thick. $A$ larger sized purine lies opposite to the smaller-sized pyrimidine, $A$ opposite to $T$ and $C$ opposite to $G$. This gives uniform width throughout $DNA$.