Why does the DNA double helix have a uniform diameter?
A)Purines pair with pyrimidines.
B)C nucleotides pair with A nucleotides.
C)Deoxyribose sugars bind with ribose sugars.
D)Nucleotides bind with nucleosides.
E)Nucleotides bind with nucleoside triphosphates.

Question

Quizplus · Accepted Answer

The purine bases (adenine and guanine) always pair with the pyrimidine bases (thymine and cytosine) in DNA. This leads to a uniform diameter of the double helix, as the two base pairs are of similar size and shape. If purines paired with purines or pyrimidines paired with pyrimidines, the diameter of the helix would vary, resulting in kinks and irregularities in the structure.

Why Does the DNA Double Helix Have a Uniform Diameter