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Question 870002
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Biomolecules and Polymers: Amino acids MCQ

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Amino acidsEasyQuestion 870002

Question

Amino acids are the building blocks of proteins. They contain both:
  1. A
    −NH₂ (amino) and −COOH (carboxyl) groups
    Correct
  2. B
    −OH and −COOH groups
  3. C
    −CHO and −NH₂ groups
  4. D
    −SH and −OH groups

Correct answer

−NH₂ (amino) and −COOH (carboxyl) groups

Explanation

An α-amino acid has NH₂ and COOH groups on the same carbon (α-carbon). At physiological pH, they exist as zwitterions (NH₃⁺/COO⁻). Essential amino acids cannot be synthesised by the body.

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