Q.

How many tripeptides are possible when Glycine, Alanine and Phenylalanine are allowed to form peptide bonds?

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answer is 6.

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Detailed Solution

  • Tripeptides are amino acids polymers in which three individual amino acid units, called residues, are linked together by amide bonds.
  • In these, an amine group from one residue forms an amide bond with the carboxyl group of a second residue, the amino group of the seconds forms and amide bond with the carboxyl group of the third.

 

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  • Therefore, glycine, (NH2​−CH2​−COOH),can be linked in six different ways.
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How many tripeptides are possible when Glycine, Alanine and Phenylalanine are allowed to form peptide bonds?