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MCQEasyJEE 2023Proteins (Amino Acids, Structure, Denaturation)

JEE Chemistry 2023 Question with Solution

Match List I with List II

List I (Natural Amino acid) and List II (One Letter Code):

(A) Arginine (I) D (B) Aspartic acid (II) N (C) Asparagine (III) A (D) Alanine (IV) R

Choose the correct answer from the options given below:

  • A

    (A) – III, (B) – I, (C) – II, (D) – IV

  • B

    (A) – IV, (B) – I, (C) – II, (D) – III

  • C

    (A) – IV, (B) – I, (C) – III, (D) – II

  • D

    (A) – I, (B) – III, (C) – IV, (D) – II

Answer

Correct answer:B

Step-by-step solution

Standard Method

Given: List I contains natural amino acids and List II contains their one letter codes.

Find: The correct matching between the amino acids and their one letter codes.

Arginine has the one letter code R. Aspartic acid has the one letter code D. Asparagine has the one letter code N. Alanine has the one letter code A.

So the correct matching is:

  • (A) Arginine →\to (IV) R
  • (B) Aspartic acid →\to (I) D
  • (C) Asparagine →\to (II) N
  • (D) Alanine →\to (III) A

Therefore, the correct option is B.

Common mistakes

  • Confusing aspartic acid with asparagine is a common mistake because their names are similar. Check the standard one letter codes carefully: aspartic acid is D, while asparagine is N.

  • Matching by the first letter of the amino acid name is wrong. One letter amino acid codes are standardized symbols, so arginine is R and alanine is A, not based on arbitrary initial matching.

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