Question

human DNA contain 31% thymine.5 % of cytosines are modified to 5-methyl cytosine after replication . what percent of human DNA is 5-methyl cytosine.​

Answer 1

human DNA contain 31% thymine.5 % of cytosines are modified to 5-methyl cytosine after replication . what percent of human DNA is 5-methyl cytosine.​

Explanation:

Spontaneous deamination of cytosine forms uracil, that are recognized and removed by DNA repair enzymes. Deamination of 5-methylcytosine forms thymine. This conversion of a DNA base from cytosine (C) to thymine (T) results in a transition mutation.  

So, either the repair enzymes for the thymine and the DNA continues with the transcription process.

Deamination causes cytosine to degrade and to convert into uracil and at the same time transcription happens.

T=31

since A=T

31+31 (A+T)=62

100-62= 38 (G+C)

38/2= C

19=C

From 19 % , 5% are modified to 5-methyl cytosine.

So, 19*5/100=0.95% is 5- methyl cytosine