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If a double stranded DNA has 20% of cyto...

If a double stranded DNA has 20% of cytosine, what will be the percentage of adenine in it ?

A

0.2

B

0.4

C

0.3

D

0.6

Text Solution

Verified by Experts

The correct Answer is:
c
(c) : According to Chargaff' s rule, the amount of adenine is always equal to that of thymine and the amount of guanine is always equal to that of cytosine, i.e., A=T and G=C. Also, the purines and pyrimidines are always in equal amounts,i.e.,A+G=T+C. Now , given dsDNA has 20% cytosine and hence guanine will be also 20% .
So, A+T must be 60% . Therefore, percentage of adenine would be `60//2=30%`
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