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Question: Answered & Verified by Expert
A segment of DNA has 120 adenine and 120 cytosine bases. The total number of nucleotides present in the segment is
BiologyMolecular Basis of InheritanceJIPMERJIPMER 2013
Options:
  • A 60
  • B 240
  • C 120
  • D 480
Solution:
1724 Upvotes Verified Answer
The correct answer is: 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.
$\begin{aligned} \mathrm{A} & =\mathrm{T}(120) \\ \mathrm{G} & =\mathrm{C}(120)\end{aligned}$
The total number of nucleotides would be $120 \times 4=480$.

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