Question

How many hydrogen bonds are present in three turns of double stranded DNA if 20% nucleotides are thymine

Answer 1

There are 78 hydrogen bonds in ds DNA if it has 20% nucleotides as thymine.

Explanation:

• In 1 turn 10 base pairs of DNA are there. In three turns there will be 30 base pairs of DNA or 60 nucleotides. 20% nucleotide from 60 nucleotides are thymine

• So, 12 nucleotides are thymine.thymine is double bonded with hydrogen bonds with adenine so 12 nucleotides are adenine according to Chargaff's rule.So it will have 24 hydrogen bonds.

• 36 nucleotides are either cytosine or guanine.so 18 nucleotides are attached by triple hydrogen bond.so  54 hydroden bonds

• As a result the total number of hydrogen bonds (24+54) is 78 hydrogen bonds

To know more about Chargaff law,

If a double stranded DNA has 40% guanine calculate the % of ...

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