Question

Which of the following does NOT correctly describe the structure of a B-DNA double helix? Group...

Which of the following does NOT correctly describe the structure of a B-DNA double helix?

Group of answer choices

one helical rotation has a rise of 34 Angstroms

antiparallel strands

base pairs are located in the center of the helix

phosphate groups located in the core of the helix

right-handed helix

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Answer #1

Phosphate groups located in the core

This option is incorrect because sugar and phosphate together form the backbone of the DNA. They are attached to each other by phosphodiester bond. The core of the double stranded DNA is made up of nitrogenous base which pair with each other according to complementary base pairing rules. Adenine pairs with thymine by two hydrogen bonds and cytosine with guanine by 3 hydrogen bonds.

Please look at the structure of double stranded DNA -

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