In a pitch of DNA helix if there are 22 hydrogen bonds between the complementary strands, what is the ratio between Adenine and Guanine bases in that helix.

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1 : 4

3 : 2

4 : 1

1 : 1

answer is A.

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Detailed Solution

A pitch of DNA helix has one complete coil or spiral and its length is 3.4nm and has 10 base pairs. The number hydrogen bonds in each pitch ranges from 20 to 30. If 22 hydrogen bonds are present, the number of AT base pairs must be 8 and GC 2. It has 16 + 6 = 22 hydrogen bonds. Hence the ratio between A and G is 8 : 2 i.e. 4 : 1

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