A tetrapeptide, made up of natural amino acids, has alanine as the N-terminal residue which

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

Ans: 4.0 to 4.0