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(A) Cyanide reacts with one of the proteins (cytochrome-$a_3$) in the electron transport system and prevents the transfer of electrons to oxygen.This

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Active transport of substances across the plasma membrane

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(A) Cyanide reacts with one of the proteins (cytochrome-$a_3$) in the electron transport system and prevents the transfer of electrons to oxygen.This leads to the inhibition of $ATP$ formation through oxidative phosphorylation.$ATP$ is required for the active transport of substances across the plasma membrane,in addition to other metabolic reactions.Therefore,active transport is the process most likely to be affected by the lack of $ATP$.

$A$ scientist added a chemical (cyanide) to an animal cell to stop aerobic respiration. Which of the following is most likely to have been affected by this treatment?

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