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Solution


Q.

If adenine makes 30% of the DNA molecule, what will be the percentage of thymine, guanine and cytosine in it                  [2021]
1 T : 20; G : 25; C : 25  
2 T : 20; G : 30; C : 20  
3 T : 20; G : 20; C : 30  
4 T : 30; G : 20; C : 20  

Ans.

(4)

According to the Chargaff’s rule,
A = T and G = C
A + G = T + C
∴ If A = 30%, then T = 30%
⇒ A + T = 60%
G + C = 100 – 60 = 40%

G = C = 20%
T = 30%, G = 20%, C = 20%