The GATE Grind

GATE 2021 CY – Question 20

Organic Chemistry · Biomolecules: Structure, properties and reactions of mono- and di-saccharides, physicochemical properties of amino acids, chemical synthesis of peptides, chemical structure determination of peptides and proteins, structural features of proteins, nucleic acids, lipids, steroids, terpenoids, carotenoids, and alkaloids. · 1 mark · Multiple choice

A correct example of a nucleotide is:

  1. adenosine monophosphate (AMP)
  2. RNA
  3. uridine
  4. DNA

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Show answer and explanation

Correct answer: (A) adenosine monophosphate (AMP)

Explanation

A nucleotide contains a nitrogenous base, a sugar and at least one phosphate group. Adenosine monophosphate contains all three and is therefore a nucleotide. Uridine is a nucleoside because it lacks phosphate; RNA and DNA are polymers of nucleotides.

Thus **AMP, A**.