During chemiosmosis, H+ ions are actively transported from the matrix of the mitochondrion into the intermembrane space, creating a concentration gradient. As the H+ ions move back into the matrix through ATP synthase, the flow of ions powers the synthesis of ATP. Therefore, ATP is synthesized when H+ ions move through a channel in ATP synthase.

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During Chemiosmosis

Question 39

Multiple Choice

During chemiosmosis,

A) energy is released as H⁺ ions move freely across mitochondrial membranes.
B) ATP is synthesized when H⁺ ions move through a channel in ATP synthase.
C) a concentration gradient is generated when large numbers of H⁺ ions are passively transported from the matrix of the mitochondrion to the mitochondrion's intermembrane space.
D) H⁺ ions serve as the final electron acceptor.

Correct Answer: