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10. Which of the following describes the effect of the electron transport chain and chemiosmosis on...

10. Which of the following describes the effect of the electron transport chain and chemiosmosis on the intermembrane space and the matrix of mitochondria?

A) The electron transport chain and chemiosmosis increase the acidity of intermembrane space and mitochondrial matrix, respectively.

B) The electron transport chain decrease the pH of the mitochondrial matrix; chemiosmosis does not change the acidity of intermembrane space.

C) The electron transport chain does not change the pH of the mitochondrial matrix; chemiosmosis increases the acidity of intermembrane space.

D) The electron transport chain decreases the pH of the mitochondrial matrix, and chemiosmosis increases the pH of intermembrane space.

E) The electron transport chain and chemiosmosis decrease the acidity of intermembrane space and mitochondrial matrix, respectively.

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Answer #1

In the electron transport chain, the H+ moves from the matrix to the intermembrane space by different protein complexes and thus there is an increased acidity due to more number of H+ in the intermembrane space. When these H+ move back via ATP synthase during chemiosmosis, there is a decrease in H+ in the intermembrane space and an increase in the matrix, thus increasing the acidity of the matrix.

so option A(The electron transport chain and chemiosmosis increase the acidity of intermembrane space and mitochondrial matrix, respectively.) is correct.

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