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Biomolecules question

2014 · Shift 1 · Q16
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Biomolecules question

2014 · Shift 1 · Q16

JEE AdvancedChemistryBiomoleculesNumerical+3 / −1
The total number of distinct naturally occurring amino acids obtained by complete acidic hydrolysis of the peptide shown below is JEE Advanced 2014 Paper 1 Offline Chemistry - Biomolecules Question 15 English
Numerical answer
View written solutionFree

Correct answer: 1

The question asks for the number of distinct naturally occurring amino acids obtained on complete acidic hydrolysis of the given peptide.

However, in the provided prompt, the structure/image of the peptide is missing. Without the peptide structure, it is not possible to determine exactly which amino acid residues are present and hence the number of distinct amino acids released after hydrolysis.

General method

On complete acidic hydrolysis of a peptide:

  1. All peptide bonds are broken.
  2. The constituent amino acids are obtained.
  3. We count only the distinct naturally occurring amino acids present in the peptide.

For example:

  • If a peptide contains Gly-Gly-Ala, the number of distinct amino acids is 222 (Gly, Ala).
  • If it contains Ala-Val-Leu-Val, the number of distinct amino acids is 333 (Ala, Val, Leu).

Issue here

Since the peptide structure is not shown, the answer cannot be independently derived from the given information.

Comparison with stored answer

The stored correct answer is given as 111. This would mean that, after hydrolysis, only one type of naturally occurring amino acid is obtained, i.e. the peptide is made entirely of repetitions of the same amino acid.

But because the peptide structure is absent, this cannot be verified from the prompt alone.

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