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Questions  

‘X’ is physiologically and biologically active form of DNA. The pitch of its helix is 34  with a distance between two adjacent base pair of about 3.4 . It shows right-hand coiling. Identify ‘X’.

a
B-DNA
b
A-DNA
c
Z-DNA
d
C-DNA

detailed solution

Correct option is A

The two chains in B-DNA are coiled in a right-handed fashion. The pitch of the helix is 3.4 nm and there are roughly 10 bp in each turn. Consequently, the distance between a bp in a helix is approximately 0.34 nm. The B-DNA is a physiologically and biologically active form of DNA.

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