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Biomolecules question

2023 · 13 Apr · Shift 2 · Q6
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Biomolecules question

2023 · 13 Apr · Shift 2 · Q6

JEE MainChemistryBiomoleculesMCQ+4 / −1
The naturally occurring amino acid that contains only one basic functional group in its chemical structure is
  1. A
    asparagine
  2. B
    arginine
  3. C
    histidine
  4. D
    lysine
View written solutionFree

Correct answer: A

  1. Identify the functional groups in each amino acid

All naturally occurring amino acids contain at least one amino group, −NH2-NH_2−NH2​, which is basic, and one carboxyl group, −COOH-COOH−COOH, which is acidic.

The question asks for the amino acid that contains only one basic functional group in its structure.

  1. Examine each option

Option A: Asparagine

Its side chain is: −CH2−CONH2-CH_2-CONH_2−CH2​−CONH2​ This contains an amide group (−CONH2)(-CONH_2)(−CONH2​), which is not basic. So asparagine has only the $-amino group as the basic functional group.

Hence, asparagine contains only one basic functional group.

Option B: Arginine

Its side chain contains a guanidino group, which is strongly basic. Along with the usual amino group, arginine has more than one basic functional group.

So, arginine is not correct.

Option C: Histidine

Its side chain contains an imidazole ring, which is basic. Along with the usual amino group, histidine has more than one basic functional group.

So, histidine is not correct.

Option D: Lysine

Its side chain contains an extra amino group (−NH2)(-NH_2)(−NH2​), which is basic. Along with the usual amino group, lysine has more than one basic functional group.

So, lysine is not correct.

  1. Conclusion

The amino acid with only one basic functional group is: Asparagine\boxed{\text{Asparagine}}Asparagine​

So the correct option is A.

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