If A and C make 30% and 20% of DNA, respectively, what will be the percentage composition of T and G?

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T : 30%, G : 20%

T : 30%, G : 30%

T : 20%, G : 20%

T : 20%, G : 30%

answer is B.

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Detailed Solution

A and C make up 30% and 20% of DNA, respectively.

Since DNA is a double-stranded molecule, A always pairs with T (adenine with thymine) and C always pairs with G (cytosine with guanine). Therefore, the percentage composition of T and G will also be 30% and 20%, respectively.

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