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NEET2009BotanyRespiration in PlantsActual

Which of the following is true regarding the given electron transport chain? CoQ Cyt c Cyt aa ₃ O ₂

Options

  1. ACoQ Cyt c is H ⁺ absorbing site.
  2. Baa ₃ O ₂, H ⁺ yielding site.
  3. CCoQ Cyt c is H ⁺ yielding site and aa ₃ O ₂ is H ⁺ absorbing site.
  4. DNo H ⁺ is absorbed or released.

Correct answer

C. CoQ Cyt c is H ⁺ yielding site and aa ₃ O ₂ is H ⁺ absorbing site.

Step-by-step solution

In electron transport chain electrons transport through a series of carriers. H ⁺ of NADH ⁺ (received from Krebs cycle) is accepted by FAD as a result of which FAD is reduced to FADH ⁺ and NADH ⁺ is oxidised to NAD ^ AD . Reduced FADH ⁺ is oxidised by CoQ , with the formation of CoQH ⁺ . H ⁺ ions then move to Cyt b, then Cyt c, Cyt a and Cyt aa ₃ . Ultimately these H ⁺ are acceped by O ₂ and H ₂ O is formed.

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