Biology Biomolecules PMC 2018
PMDC Verified Question 130 of 142
Which of the following is an unsaturated fatty acid?
A
Butyric acid
B
Oleic acid
C
Stearic acid
D
Palmitic acid
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Oleic acid
Concept:

Knowing the common names and saturation status of major biological fatty acids is a standard requirement.

Solution:

  • Oleic acid (the primary component of olive oil) is an 18-carbon fatty acid containing exactly one double bond between carbons 9 and 10.


  • Because of this double bond, it is classified as a mono-unsaturated fatty acid.


Why other options are incorrect:

  • Butyric acid (C4), Palmitic acid (C16), and Stearic acid (C18): These are all fully saturated fatty acids, containing absolutely zero carbon-carbon double bonds in their aliphatic chains.

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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