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MHT CET Medical202622 April 2026Evening ShiftBiologyRespiration in PlantsActual

During ETS, when ubiquinol is oxidized by the cytochrome bc₁ complex, the electrons released are transferred to ____.

Options

  1. ACytochrome a
  2. BCytochrome a₃
  3. CCytochrome C
  4. DMolecular oxygen

Correct answer

C. Cytochrome C

Step-by-step solution

In the mitochondrial electron transport system (ETS), ubiquinol is oxidized by the cytochrome bc₁ complex (Complex III). During this oxidation, the electrons are transferred to cytochrome c, which is a small mobile protein attached to the outer surface of the inner mitochondrial membrane. Cytochrome c then acts as a mobile carrier to transfer these electrons between Complex III and Complex IV (cytochrome c oxidase complex, which contains cytochromes a and a₃ ). Answer: Cytochrome C

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