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

Options

A. The antiparallel nature
B. Uniform length in all DNA
C. Uniform width throughout DNA
D. The semiconservative nature

Answer

C

Explanation

The bases in two strands are paired through hydrogen bond (H-bonds) forming base pairs (bp). Adenine forms two hydrogen bonds with Thymine from oposite strand and vice-versa. Similarly, guanine is bonded with Cytosine with three H-bonds. As a result, always a purine comes opposite to a pyrimidine. This generates approximately uniform distance between the two strands of the helix.