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Biology · BIOMOLECULES

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Which of the following correctly pairs an amino acid with the exact chemical nature of its substituent 'R' group as described in living systems?

  1. Alanine — Hydroxy methyl group (-CH2-OH)
  2. Serine — Methyl group (-CH3)
  3. Lysine — Carboxylic acid group (-COOH)
  4. Glycine — Hydrogen atom (-H)

Correct answer · Option 4

Glycine — Hydrogen atom (-H)

Explanation

In glycine the R group is hydrogen (-H), in alanine it is a methyl group (-CH3), and in serine it is a hydroxy methyl group (-CH2-OH). Lysine is a basic amino acid with an amino-containing side chain.

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