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Question:

If the total amount of adenine and thymine in a double-stranded DNA is 60?

30

40

15

20

Solution:

If the amount of adenine+ thymine = 60, then the amount of guanine + cytosine will also be 60 (because A=T and G=C in a double-stranded DNA molecule, and the total amount of A+T = G+C). Therefore, the total amount of each base pair is 60.