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

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Correct answer: 4

Following combinations are possible for tetrapeptide:

\begin{array}{ll}\text{Val} - \text{Phe} - \text{Gly} - \text{Ala} \\ \text{Val} - \text{Gly} - \text{Phe} - \text{Ala} \\ \text{Phe} - \text{Gly} - \text{Val} - \text{Gly} \\ \text{Phe} - \text{Val} - \text{Gly} - \text{Ala}\end{array}

In all above sequences, C-terminal is alanine.
Glycine is optically inactive amino acid, it can not be N-terminal. Hence, only above combinations are possible.

A tetrapeptide has -COOH group on alanine. This produces glycine...

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