Question

One turn of the helix in a B-form DNA is approximately (1)2nm (2)20 nm (3)034nm (4)34nm

Answer 1

Answer:

answer is (4)34nm

Explanation:

In a DNA molecule, the two strands are not parallel, but intertwined with each other. Each strand looks like a helix. The two strands form a "double helix" structure, which was first discovered by James D. Watson and Francis Crick in 1953. In this structure, also known as the B form, the helix makes a turn every 3.4 nm, and the distance between two neighbouring base pairs is 0.34 nm.