Biology Biomolecules NUMS 2023
PMDC Verified Question 62 of 142
C-H bonds in lipids are important:
A
As insulating material
B
Providing more energy
C
As exoskeleton
D
As cuticle of leaves
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Providing more energy
Concept:

The massive thermodynamic yield of lipids is rooted strictly in their chemical structure.

Solution:

  • During cellular respiration, high-energy electrons are harvested directly from non-polar C-H bonds to power the electron transport chain.


  • Lipids contain incredibly long aliphatic tails composed almost entirely of C-H bonds.


  • Because they possess such a massive proportion of these easily oxidizable bonds compared to carbohydrates, the specific fundamental importance of C-H bonds is providing more energy (more than double the yield per gram).


Why other options are incorrect:

  • Insulation / Cuticle: These are macroscopic physical functions of the lipid molecule as a whole (due to its hydrophobicity), not the specific thermodynamic importance of the individual C-H bond itself.


  • Exoskeleton: Formed by chitin (a carbohydrate), not lipids.

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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