Biology Biomolecules KMU 2024
PMDC Verified Question 28 of 142
What is the ester of fatty acids and long chain alcohol called?
A
Acylglycerol
B
Glycerol
C
Phospholipid
D
Wax
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Wax
Concept:

Waxes are the ultimate biological waterproofing agents, designed for maximum hydrophobicity.

Solution:

  • Unlike standard fats which use the short 3-carbon glycerol as a backbone, Waxes are synthesized by forming a single ester bond between one massively long-chain fatty acid and one massively long-chain monohydroxy alcohol (often 20 to 30 carbons long each).


  • This creates an incredibly long, rigid, straight-chain lipid that packs tightly into a solid, forming an impenetrable, highly hydrophobic barrier (e.g., beeswax, cutin on leaves, earwax).


Why other options are incorrect:

  • Acylglycerol / Phospholipid: These are specifically defined as esters formed uniquely with the short 3-carbon alcohol glycerol, not "long chain alcohols".


  • Glycerol: This is just the bare alcohol molecule itself, not the resulting esterified lipid 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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