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MCQEasyJEE 2026Proteins (Amino Acids, Structure, Denaturation)

JEE Chemistry 2026 Question with Solution

The number of possible tripeptides formed involving alanine (ala), glycine (gly) and valine (val), where no amino acid has been used more than once is

  • A

    33

  • B

    66

  • C

    88

  • D

    44

Answer

Correct answer:B

Step-by-step solution

Standard Method

Given: A tripeptide is to be formed using alanine (ala), glycine (gly) and valine (val), with no amino acid repeated.

Find: The number of different tripeptides possible.

Step 1: Understanding the concept. A tripeptide consists of three amino acids joined in a specific sequence. The order of amino acids matters, and no amino acid can be repeated.

Step 2: Counting permutations. Three different amino acids can be arranged in

3!=63! = 6

different ways.

Step 3: Conclusion. Thus, six different tripeptides can be formed. Therefore, the correct option is B.

Common mistakes

  • Treating the arrangement as a combination instead of a permutation. This is wrong because peptide sequence matters; ala-gly-val and gly-ala-val are different tripeptides. Count ordered arrangements instead.

  • Allowing repetition of an amino acid. This is wrong because the question clearly states that no amino acid has been used more than once. Use each of the three amino acids exactly once.

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