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Question

A segment of DNA has 120 adenine and 120 cytosine bases. The total number of nucleotides present in the segment is:

A
120
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B
240
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C
360
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D
480
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Solution

The correct option is D 480
According to Chargaff's rules, the amount of adenine is always equal to that of thymine, and the amount of guanine is always equal to that of cytosine i.e A = T = 120 and G = C = 120, therefore, the total no. of nucleotides would be 120×4=480.

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