How many different linear tripeptides can be made using glycine, alanine and valine, each used exactly once?
Correct answer A. 6
Explanation
The tripeptide has an N-terminal end and a C-terminal end, so order matters. The number of arrangements of three different amino acids is 3! = 3 × 2 × 1 = 6. The value 27 allows repetition.
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