Q161 / 180 · AIIMS 2015 · Zoology

Which one of the following is an incorrect combination?

  • Correct answer
    A
    Adenine, thymine, cytidine
  • B
    Adenine, cytosine, thymine
  • C
    Guanine, thymine, uracil
  • D
    Cytosine, uracil, guanine

Solution

Adenine (A), guanine (G), cytosine (C), thymine $(T)$ and uracil $(U)$ are all nitrogenous bases, whereas cytidine is a nucleoside i.e., a combination of a nitrogenous base (cytosine) with a pentose sugar (ribose).

Hence, the correct answer is option: 'A'.

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