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WBCS Preliminary Examination 2015 — General Studies · Question 125 of 200

Q125
General ScienceBiology
The Pyrimidine bases in a DNA are:
  1. a.Adenine and Guanine
  2. b.Thymine and Adenine
  3. c.Cytosine and Guanine
  4. d.Thymine and Cytosine

Answer: (D) Thymine and Cytosine

DNA contains two types of nitrogenous bases: Purines (Adenine and Guanine, which have a double-ring structure) and Pyrimidines (Thymine and Cytosine, which have a single-ring structure). In RNA, Uracil replaces Thymine. The base pairing rule is A-T and G-C in DNA.

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