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MHT CET Medical202626 April 2026Morning ShiftBiologyRespiration in PlantsActual

Identify the correct sequence of cytochromes involved in ETS.

Options

  1. AC_y t C C_y tb c₁ C_y t a C_y t a₃
  2. BC_y t bc₁ C_y t C C_y t a C_y t a₃
  3. CC_y t a C_y t C C_y t bc₁ C_y t a₃
  4. DC_y t a₃ C_y t C C_y t a C_y t bc₁

Correct answer

B. C_y t bc₁ C_y t C C_y t a C_y t a₃

Step-by-step solution

In the electron transport system (ETS), electrons are transferred from ubiquinol to cytochrome c via the cytochrome bc₁ complex (Complex III). Cytochrome c is a small protein attached to the outer surface of the inner mitochondrial membrane and acts as a mobile carrier for the transfer of electrons between Complex III and Complex IV. Complex IV refers to the cytochrome c oxidase complex containing cytochromes a and a₃ , along with two copper centers. Thus, the correct sequence of electron transfer through the cytoc

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