Biology Biomolecules ETEA 2022
PMDC Verified Question 99 of 142
The type of lipids which do not contain fatty acids are:
A
Phospholipids
B
Waxes
C
Steroids
D
Acylglycerol
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Steroids
Concept:

Lipids are a chemically diverse group united primarily by their insolubility in water, rather than a shared monomer structure.

Solution:

  • Most standard lipids (fats, oils, waxes, phospholipids) are built by chemically bonding long-chain fatty acids to an alcohol backbone.


  • Steroids, however, are a structurally distinct class of lipids entirely devoid of fatty acid chains.


  • Instead, they are constructed from a rigid skeleton of exactly four fused carbon rings (synthesized from isoprene units). Examples include cholesterol, testosterone, and estrogen.


Why other options are incorrect:

  • Acylglycerols & Phospholipids: Directly built using 2 to 3 fatty acid tails.


  • Waxes: Esters of one very long-chain fatty acid linked to one very long-chain alcohol.

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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