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NEET BIOLOGYMedium

If Adenine makes 30% of the DNA molecule, what will be the percentage of Thymine, Guanine and Cytosine in it?

A

T : 20 ; G : 30 ; C : 20

B

T : 20 ; G : 20 ; C : 30

C

T : 30 ; G : 20 ; C : 20

D

T : 20 ; G : 25 ; C : 25

Step-by-Step Solution

According to Chargaff's rule, for a double stranded DNA, [A]=[T][A] = [T]. Since [A]=30%[A] = 30\%, then [T]=30%[T] = 30\%. Since [C]=[G][C] = [G], then 100−[A+T]=100−[30+30]=100−60=40%100 - [A + T] = 100 - [30 + 30] = 100 - 60 = 40\%. Thus, C=G=20%C = G = 20\% each. Therefore, [A]=30%,[T]=30%,[G]=20%,[C]=20%[A] = 30\%, [T] = 30\%, [G] = 20\%, [C] = 20\%.

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