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If the ratio of (T + C)/(A+ G) in one strand of DNA is 1.43, same ratio in the complementary strand is :

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0.35

0.70

1.43

2.10

answer is B.

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Detailed Solution

Pyrimidine/purine ratio on the first strand is 1.43/1 = 143/100

So, in the first strand, out of every 243 bases, there are 143 pyrimidines and 100 purines

Purine in one strand always pairs with a pyrimidine in the other strand.

So, in the second strand, out of every 243 bases, there must be 100 pyrimidines and 143 purines

Pyrimidine/purine ratio on the second strand must be 100/143 = 0.7

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