A segment of DNA has 120 adenine and 120 cytosine bases.

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

1. 120
2. 240
3. 60
4. 480

Correct Option: D

According to Chargaff’s rule, the amount of adenine is always equal to thymine and that of guanine equal to cytosine. Moreover,
A + G = T + C.
120 + 120 = 120 + 120
240 = 240
So there will be 480 nucleotides in all.