Number of cyclic tripeptides formed with 2 amino acids A and B is:
Biomolecules · Class 12 · JEE Main Previous Year Question
Number of cyclic tripeptides formed with 2 amino acids A and B is:
- a
2
- b
3
- c
5
- d✓
4
4
Step 1: Cyclic Tripeptide Logic — For a cyclic tripeptide with two types of amino acids A and B, we look at the unique circular permutations.
Step 2: Possible Combinations — The sequences are: (A,A,A), (B,B,B), (A,A,B), and (B,B,A). Note that (A,B,A) is the same as (A,A,B) in a cyclic arrangement.
Step 3: Count — This results in a total of 4 unique cyclic arrangements. Correct option is (d).
Key Point: Cyclic structures remove the concepts of N- and C-terminal ends, making circular symmetry important.
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