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Match the following

List - I

List - II
i)
Length of the one coil of DNA
a)
Nucleoside
ii)
Number of bases in 1 turn of DNA
b)
3.4 n.m
iii)
Diameter of DNA helix
c)
20
iv)
Adenosine
d)
20 A°

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i-a, ii-b, iii-c, iv-d

i-b, ii-a, iii-c, iv-d

i-c, ii-a, iii-b, iv-d

i-b, ii-c, iii-d, iv-a

answer is D.

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Detailed Solution

NCERT Page No.81, 82

Watson and Crick B form of DNA dimensions

Salient features :

Double-helix structure of DNA ,diameter of helix is 20A.

It is made of two polynucleotide chains,

The bases in two strands are paired through hydrogen bond (H-bonds) forming base pairs (bp)

The two chains are coiled in a right-handed fashion.

The pitch of the helix is 3.4 nm (height of one turn),10 bp in each turn.

the distance between a bp in a helix is approximately 0.34 nm.

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