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Which pair of nitrogenous bases is wrongly matched with its category?

  1. A
    Adenine, Thymine — Purines
  2. B
    Thymine, Uracil — Pyrimidines
  3. C
    Uracil, Cytosine — Pyrimidines
  4. D
    Guanine, Adenine — Purines

Solution & Step-by-step Explanation

Purines are double-ring structures: Adenine and Guanine. Pyrimidines are single-ring structures: Cytosine, Thymine, and Uracil. Thymine is a pyrimidine, not a purine.

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Which pair of nitrogenous bases is wrongly matched with its category?
A
Adenine, Thymine — Purines
B
Thymine, Uracil — Pyrimidines
C
Uracil, Cytosine — Pyrimidines
D
Guanine, Adenine — Purines

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Molecular BiologyDNANitrogenous Bases

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