Biology Biomolecules ETEA 2022
PMDC Verified Question 100 of 142
The glycerol is a ____ carbon compound.
A
Four
B
Three
C
Five
D
Six
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Three
Concept:

Glycerol acts as the universal foundational backbone for triacylglycerols and phospholipids.

Solution:

  • Glycerol (also known as glycerin) is structurally a simple polyol (sugar alcohol).


  • Its chemical formula is \(C_3H_8O_3\).


  • Structurally, it consists of exactly three carbon atoms, each holding one reactive hydroxyl (\(-OH\)) group available to form ester bonds with fatty acids.


Why other options are incorrect:

  • Compounds with four, five, or six carbons (like ribose or glucose) belong to entirely different carbohydrate classes and are not the lipid backbone.

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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