Question

How many hydrogen bonds are present in three turns of dsDNA if 20% nucleotides are thymine

Answer 1

Answer:

Explanation:

12 double bonds and 18 triple bonds

so total= (12*2)+(18*3)=24+54=78 H bonds

Answer 2

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. Each base pair is 3.4 armstrong distance and total length of the DNA is 34 Armstrong.

In three turns there will be 30 base pairs of DNA or 60 nucleotides.

So from the question 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.

Now from 24 nucleotides

60-24

=  36 nucleotides are either cytosine or guanine.

so 18 nucleotides are attached by triple hydrogen bond.

so 18*3

-= 54 hydroden bonds

Total number of hydrogen bonds 24+54

                             = 78 hydrogen bonds.

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