MCQEasyJEE 2024Proteins (Amino Acids, Structure, Denaturation)

JEE Chemistry 2024 Question with Solution

Type of amino acids obtained by hydrolysis of proteins is:

  • A

    β\beta

  • B

    α\alpha

  • C

    δ\delta

  • D

    γ\gamma

Answer

Correct answer:A

Step-by-step solution

Standard Method

Given: Proteins on hydrolysis break into their constituent amino acids.

Find: The type of amino acids obtained.

Proteins are long chains of amino acids joined by peptide bonds. On hydrolysis, these peptide bonds are cleaved and individual amino acids are released.

The amino acids present in proteins are α\alpha-amino acids. In these, the amino group NH2-\text{NH}_2 is attached to the α\alpha-carbon adjacent to the carboxyl group COOH-\text{COOH}.

Hence, hydrolysis of proteins yields α\alpha-amino acids.

The solution states the correct option as A, but the extracted option list shows α\alpha as option B. Based on the solution working and the actual option text, the chemically correct choice is α\alpha, corresponding to option B in the extracted options.

Common mistakes

  • Confusing the position labels α\alpha, β\beta, γ\gamma, and δ\delta with random option order. These labels refer to the carbon position of the amino group, so proteins specifically give α\alpha-amino acids on hydrolysis.

  • Assuming hydrolysis can change the type of amino acid. Hydrolysis only breaks peptide bonds; it does not convert protein amino acids into β\beta-, γ\gamma-, or δ\delta-amino acids.

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