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JIPMER 2013
Exam
JIPMER
Year
2013
Subject
Zoology
Chapter
Molecular Basis of Inheritance

JIPMER 2013 · Zoology · Molecular Basis of Inheritance

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

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

Options

  1. A60
  2. B240
  3. C120
  4. D480

Correct answer

D. 480

Step-by-step solution

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. A=T(120)G=C(120)\begin{aligned} \mathrm{A} & =\mathrm{T}(120) \\ \mathrm{G} & =\mathrm{C}(120)\end{aligned} The total number of nucleotides would be 120×4=480120 \times 4=480.
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