Biology Biomolecules MDCAT 2017
PMDC Verified Question 135 of 142
If in lipids there is a higher proportion of unsaturated fatty acid, then it will be:
A
Phenols
B
Waxes
C
Fats
D
Oils
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Oils
Concept:

The physical state of a lipid at room temperature is dictated by the chemical saturation of its hydrocarbon tails.

Solution:

  • Unsaturated fatty acids contain one or more carbon-carbon double bonds (\(C=C\)).


  • These double bonds introduce rigid "kinks" or bends into the hydrocarbon chain, physically preventing the lipid molecules from packing tightly together.


  • Because they cannot pack densely, the intermolecular forces remain weak, causing the lipid to exist as a liquid (Oil) at room temperature.


Why other options are incorrect:

  • Fats: Highly saturated lipids (no double bonds), allowing them to pack tightly and remain solid at room temperature (e.g., butter, lard).


  • Waxes: Extreme long-chain solid lipids, used for waterproofing.


  • Phenols: Aromatic organic compounds completely unrelated to triacylglycerols.

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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