Biology Bioenergetics KMU 2024
PMDC Verified Question 1 of 67
The process of ATP synthesis through a combination of electrochemical and osmotic events is known as:
A
Fermentation
B
Glycolysis
C
Oxidative phosphorylation
D
Oxidation of pyruvate to acetyl CoA
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Oxidative phosphorylation
Concept:

The synthesis of ATP driven by a proton gradient across a membrane is formally known as chemiosmosis.

Solution:

  • During cellular respiration, this chemiosmotic generation of ATP is coupled to the transfer of electrons from NADH/FADH2 to oxygen.
  • Because it relies on oxygen as the final electron acceptor and involves a proton (osmotic) gradient, the entire combined process is called Oxidative phosphorylation.


Why other options are incorrect:

  • Glycolysis and fermentation generate ATP via substrate-level phosphorylation, which involves direct enzymatic transfer of a phosphate group, not an electrochemical gradient.

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