The number of possible tripeptides formed involving alanine (ala), glycine (gly) and valine (val), where no amino acid has been used more than once is:
(4) 6
Each tripeptide uses ala, gly and val once each; only their sequence changes.
Number of sequences = 3! = 6:
ala-gly-val, ala-val-gly, gly-ala-val, gly-val-ala, val-ala-gly, val-gly-ala
Answer: (4)
From the given following (A to D) cyclic structures, those which will not react with Tollens' reagent are: [figure]
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