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Question

The number of base pairs in each turn of Z-DNA and B-DNA helices respectively is

A
9 and 11
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B
12 and 10
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C
10 and 13
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D
12 and 11
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Solution

The correct option is B 12 and 10
B-DNA is physiologically the most important form of DNA. The double helical secondary structure model of DNA described by Watson and Crick was the B-DNA. As per the original model, it contains 10 bp per turn but later measurements showed that it contains 10.5 base pairs per turn. Z DNA is the zigzag DNA. It is left handed helix. There are 12 base pair per turn, with a rise of 0.38 nm per base pair.
So, the correct answer is option B.

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