CELL RESPIRATION
OXIDATIVE PHOSPHORYLATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Into the mitochondrial matrix
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Into the intermembrane space
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Into the cytosol
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Into the thylakoid
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Detailed explanation-1: -In the matrix, NADH and FADH2 deposit their electrons in the chain (at the first and second complexes of the chain, respectively). The energetically “downhill” movement of electrons through the chain causes pumping of protons into the intermembrane space by the first, third, and fourth complexes.
Detailed explanation-2: -In complex III, protons are carried across the membrane by coenzyme Q, which accepts protons from the matrix at complexes I or II and releases them into the intermembrane space at complex III. Complexes I and III each transfer four protons across the membrane per pair of electrons.
Detailed explanation-3: -In response to electron transport, a total of ten protons (H+) (two from Complex III, and four from each Complex I and Complex IV) are pumped from the matrix into the intermembrane space, where they accumulate to generate an electrochemical proton gradient known as the mitochondrial membrane potential (