Chemistry Macromolecules / Biochemistry MDCAT 2019
PMDC Verified Question 39 of 47
Which of the following bond is responsible for joining the amino acids in proteins?
A
Peptide Bond
B
Metallic Bond
C
Di sulfide bond
D
Ionic Bond
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Peptide Bond
Concept:

The primary structure of a protein is defined by the linear sequence of amino acids linked together by covalent bonds.

Formula:

$$ \text{-CO-NH-} $$

Solution:

  • During translation in ribosomes, amino acids undergo a condensation reaction.
  • The carboxyl group of one amino acid reacts with the amino group of the next, releasing water and forming a covalent amide linkage known specifically as a peptide bond.


Why other options are incorrect:

Disulfide bonds connect cysteine residues to stabilize tertiary structure but do not form the main primary backbone between all amino acids. Ionic and metallic bonds are not the linkages that polymerize amino acids.

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.

Previous Question All Macromolecules / Biochemistry MCQs Next Question

Want to solve full-length papers under timed exam conditions?

Practice with zero-scroll lockdown sprints, dynamic latency zone timers, live peer selection telemetry, and the automated Amber mistake recovery loop.

Enter Arena Sprint iOS App Android App