Q.

Following tetrapeptide can be represented as

(F, L, D, Y, I, Q, P are one letter codes for amino acids)             [2023]

1 PLDY  
2 FLDY  
3 FIQY  
4 YQLF  

Ans.

(2)

Amino acid chain or peptide chain is often named starting from N-terminal ending towards C-Terminal. So FLDY is the best combination.