Which of the following statements is(are)TRUE about oxidative phosphorylation?
(I)Electron transport provides energy to pump protons into the intermembrane space.
(II)An electrochemical gradient is formed across the inner mitochondrial membrane.
(III)Potassium and sodium ions form an ionic gradient across the inner mitochondrial membrane.
(IV)Complexes I,II,III,IV actively transport protons into the intermembrane space during electron transport.
A)I,II,III,IV
B)I,II,IV
C)II,III,IV
D)I,IV
E)II,IV

Question

Quizplus · Accepted Answer

Statement I is true as electron transport chain provides energy to pump protons into the intermembrane space.
Statement II is true as an electrochemical gradient of protons is formed across the inner mitochondrial membrane due to the pumping of protons.
Statement III is false as potassium and sodium ions do not contribute to the gradient formed during oxidative phosphorylation.
Statement IV is true for complexes I, III, and IV, but not for complex II. Complex II does not transport protons, it only passes electrons to coenzyme Q. Therefore, the correct answer is option B.

Which of the Following Statements Is(are)TRUE About Oxidative Phosphorylation