Biology Bioenergetics UHS 2023
PMDC Verified Question 24 of 67
Which is the main event in electron transport chain?
A
ATP synthesis
B
Decarboxylation
C
Substitution
D
Isomerisation
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: ATP synthesis
Concept:

The electron transport chain (ETC) is the final and most productive phase of cellular respiration.

Solution:

  • The primary purpose and main functional event of the ETC is to generate a proton gradient that drives the enzyme ATP synthase.
  • This results in massive ATP synthesis via oxidative phosphorylation.


Why other options are incorrect:

  • Decarboxylation (removal of \( CO_2 \)) happens during the link reaction and Krebs cycle.
  • Isomerisation and substitution are chemical reactions that occur heavily in glycolysis and the Krebs cycle, not the main event of the ETC.

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