Q.

How many base pairs are present in each full turn of the DNA double helix?

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a

4

b

6

c

8

d

10

answer is D.

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Detailed Solution

10 base pairs are present in each full turn of the DNA double helix.The bases are nearly perpendicular to the helix axis, and adjacent bases are separated by 3.4 . The helical structure repeats every 34 , so there are 10 bases (= 34 per repeat/3.4 per base) per turn of helix. There is a rotation of 36 degrees per base (360 degrees per full turn/10 bases per turn).
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