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Q.

A tetrapeptide made up of natural amino acid has leucine as the N-terminal residue which is coupled to a chiral amino acid. Upon complete hydrolysis, the tetrapeptide gives alanine, phenylalanine, glycine and leucine. The total number of possible sequences of the tetrapeptide is:

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answer is 4.

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Detailed Solution

Leucine form N- terminal then possible combination 
Leu – Ala – phen – gly 
Leu – phen – Ala – gly 
Leu –Ala – gly –phe 
Leu – phe – gly –Ala

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