Question

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Q. In a DNA molecules number of cytosine and thymine bases are same. If there are 125 adenine molecules in DNA, then how many hydrogen bonds will be there between paired bases

Answer 1

Dear student,
There are 125 adenine molecules in DNA.
We know that the adenine forms double hydrogen bond with thymine,so the number of adenine molecules will be equal to the number of thymine bases.
So,the total number of thymine bases will be 125 and the hydrogen bonds between A and T will be 125x2=250
It is given that the number of thymine bases are equal to the number of cytosine bases.
So,the number of cytosine bases will be also equal to 125.We know that the three hydrogen bonds are present between guanine and cytosine.
So, total number of hydrogen bonds between G and C =125x3=375
The total number of hydrogen bonds between paired bases (A=T and G triple bond C) =250+375=625.
Regards