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JEE Main · 2024 · 01 Feb 2024 · Shift 2 · Biomolecules

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The number of tripeptides formed by three different amino acids using each amino acid once is ____.

Answer: 6

Solution

A tripeptide has a fixed direction from N-terminus to C-terminus, so each distinct ordering of the three amino acids gives a chemically distinct tripeptide. With three different amino acids A, B, C used once each, the number of possible sequences is : ABC, ACB, BAC, BCA, CAB, CBA.

JEE Main · 2024 · 01 Feb 2024 · Shift 2 · Integer answer

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