First slide

Proteins

Question

Consider three amino acids A, B and C. How many tripeptides are possible without repeating any of the amino acid in the chain.

Moderate

A

27
B

18
C

12
D

6

Solution

A tripeptide contains three amino acid residues;
Without repeating any of these acids, the possible tripeptides are
(1)…A-B-C
(2)…A-C-B
(3)…B-A-C
(4)…B-C-A
(5)…C-A-B
(6)…C-B-A

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