Biology Biomolecules AJK 2019
PMDC Verified Question 123 of 142
What type of linkage is formed when an alcohol and an acid react?
A
Hydrogen bond
B
Peptide bond
C
Glycosidic linkage
D
Ester bond
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Ester bond
Concept:

Specific functional group reactions define the synthesis of biological polymers.

Solution:

  • When a carboxylic acid (such as a fatty acid) reacts with an alcohol (such as glycerol), a condensation reaction occurs.


  • The resulting covalent linkage uniting the two molecules is specifically called an Ester bond (\(-C-O-C(=O)-\)), accompanied by the release of water.


  • This is the fundamental reaction that builds triglycerides and other lipids.


Why other options are incorrect:

  • Peptide bond: Formed between an amino group and a carboxyl group (proteins).


  • Glycosidic linkage: Formed between two hydroxyl (alcohol) groups (carbohydrates).


  • Hydrogen bond: A weak intermolecular physical attraction, not a covalent reaction product.

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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