Tetrapeptide is made of naturally occuri...

Tetrapeptide is made of naturally occuring alanine , serine glycine and valine . If the C-terminal amino acid is alanine and the N-terminal amino acid is chiral , the number of possible sequences of the tetrapeptide is

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Amino acid alanine is

Alanine and valine are neutral alpha -amino acids.

Draw the structure of the amino acid, alanine.

A tetrapeptide has -COOH group on alanine. This produces glycine (Gly), valine (Val), phenyl alanine (Phe) and alanine (Ala), on complete hydrolysis. For this tetrapeptide, the number of possible sequences (primary structures) with -NH_(2) group attached to a chiral centre is :

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