Question:medium

Following tetrapeptide can be represented as
tetrapeptide

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

Updated On: Mar 12, 2026
  • PLDY
  • FIQY
  • YQLF
  • FLDY
Show Solution

The Correct Option is D

Solution and Explanation

The given image represents a tetrapeptide structure. We need to determine the sequence of amino acids in this tetrapeptide using the one-letter codes provided:

tetrapeptide

To identify the tetrapeptide, let's decode each amino acid from left to right:

  1. Phenylalanine (F): Identified by the presence of the benzyl side chain (C6H5CH2-) which is characteristic of phenylalanine.
  2. Leucine (L): Detected by the isobutyl side chain (-CH(CH3)2), which is the hallmark of leucine.
  3. Aspartic Acid (D): Contains a carboxyl group (COOH) in addition to the usual amino acid backbone, reflecting the structure of aspartic acid.
  4. Tyrosine (Y): Recognized by the para-hydroxy phenyl group (-C6H4OH), which is typical for tyrosine.

By combining the one-letter codes for these amino acids in the order they appear, the sequence of the tetrapeptide is 'FLDY'.

Thus, the correct representation for the tetrapeptide is FLDY.

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