Biology Bioenergetics SZABMU 2024
PMDC Verified Question 4 of 67
The type of phosphorylation which involves the transfer of electrons from NADH to Coenzyme Q in the inner mitochondrial membrane is called:
A
Cyclic Phosphorylation
B
Non-cyclic Phosphorylation
C
Oxidative Phosphorylation
D
Substrate level Phosphorylation
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:

Phosphorylation (the addition of a phosphate to ADP) is classified by the energy source driving the reaction.

Solution:

  • The transfer of electrons from NADH to Coenzyme Q is the first step of the mitochondrial electron transport chain.
  • The energy released from this redox transfer pumps protons, creating a gradient that drives ATP synthase.
  • Because this entire process is dependent on redox reactions ending with oxygen, it is termed Oxidative Phosphorylation.


Why other options are incorrect:

  • Cyclic and Non-cyclic phosphorylation are light-driven processes occurring in chloroplasts (photosynthesis).
  • Substrate-level phosphorylation relies on direct enzyme transfer without an ETC.

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