Biology Biomolecules SZABMU 2024 Reconduct
PMDC Verified Question 24 of 142
Two amino acids form a dipeptide through:
A
Condensation reaction
B
Hydrolysis
C
Ionic bond formation
D
Hydrogen bonding
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Condensation reaction
Concept:

Biological monomers are forced together via specific water-removing synthetic reactions.

Solution:

  • To link two separate amino acids into a unified dipeptide, the carboxyl group of the first must covalently bond to the amino group of the second.


  • To free up the bonding electrons required, an \(-OH\) and an \(-H\) are forcefully stripped away from the monomers and expelled as a newly formed water molecule.


  • Because a larger molecule is built via the removal of water, this is universally termed a Condensation reaction (or dehydration synthesis).


Why other options are incorrect:

  • Hydrolysis: The exact opposite; adds water to smash the dipeptide back into two separate amino acids.


  • Hydrogen bonding / Ionic bond: These are weak physical interactions that govern 3D folding later on; they do not form the tough covalent backbone required to link monomers.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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