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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 answer: 480

Solution

In double-stranded DNA, adenine pairs with thymine and cytosine pairs with guanine. So 120 A means 120 T, and 120 C means 120 G, giving 120 + 120 + 120 + 120 = 480 nucleotides total.

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