In oxidative photophosphorylation,the last 3 | vedclass

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Question

(C) In the electron transport system $(ETS)$ of mitochondria,the transfer of electrons from ubiquinone $(Q)$ to cytochrome $c$ $(C)$ involves the pump

Vedclass · Accepted Answer

$Q 	o C$ is an $H^+$ yielding site and $aa_3 	o O_2$ is an $H^+$ absorbing site.

Vedclass · Answer

(C) In the electron transport system $(ETS)$ of mitochondria,the transfer of electrons from ubiquinone $(Q)$ to cytochrome $c$ $(C)$ involves the pumping of protons $(H^+)$ into the intermembrane space,acting as an $H^+$ yielding site.Subsequently,the transfer of electrons from cytochrome $aa_3$ (cytochrome $c$ oxidase) to oxygen $(O_2)$ involves the consumption of protons from the matrix to form water $(H_2O)$,thus acting as an $H^+$ absorbing site.Therefore,$Q 	o C$ is an $H^+$ yielding site and $aa_3 	o O_2$ is an $H^+$ absorbing site.

In oxidative photophosphorylation,the last $3$ steps are as follows: $Q \to C \to aa_3 \to O_2$. Which of the following statements is correct regarding the proton $(H^+)$ movement?

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