Number of cyclic tripeptides formed with 2 amino acids A and B is:

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Canvas Classes · Accepted Answer

A cyclic tripeptide forms a ring structure, meaning linear sequences that are cyclic permutations of one another represent the exact same molecule. 
For sequences of length 3 using letters A and B:
1. AAA (All three same)
2. AAB (AAB, ABA, and BAA are equivalent when joined in a circle)
3. ABB (ABB, BAB, and BBA are equivalent)
4. BBB (All three same)
Thus, there are exactly 4 distinct cyclic tripeptides.

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