Chemistry Macromolecules / Biochemistry BUMHS 2022
PMDC Verified Question 29 of 47
The main structural feature of proteins is:
A
Ester linkage
B
Glycoside linkage
C
Ether linkage
D
Peptide linkage
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Peptide linkage
Concept:

The defining chemical characteristic of a protein is its polyamide backbone.

Formula:

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

Solution:

  • Proteins consist of amino acids attached end-to-end.
  • This continuous covalent chain is formed entirely by peptide linkages (amide bonds). This makes the peptide bond the central structural feature of all proteins.


Why other options are incorrect:

Ester linkages form lipids (triglycerides). Glycoside linkages form polysaccharides (carbohydrates). Ether linkages (\( \text{R-O-R'} \)) are not the primary backbone of biological macromolecules.

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