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Which of the following is an electron carrier that plays a role in cellular respiration?
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8. Respiration
Electron Transport Chain
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What is the source of energy for making ATP by oxidative phosphorylation in the electron transport chain?
A
Breakdown of glucose
B
Proton gradient across the mitochondrial membrane
C
Hydrolysis of ATP
D
Direct transfer of electrons to ATP
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Understand the process of oxidative phosphorylation: It occurs in the mitochondria and is the final stage of cellular respiration, where ATP is produced.
Recognize the role of the electron transport chain: Electrons are transferred through a series of complexes in the inner mitochondrial membrane, releasing energy.
Identify the creation of the proton gradient: As electrons move through the chain, protons (H⁺ ions) are pumped from the mitochondrial matrix to the intermembrane space, creating a gradient.
Explain how the proton gradient is used: The gradient creates potential energy, which is harnessed by ATP synthase to convert ADP and inorganic phosphate into ATP.
Clarify why the proton gradient is the source of energy: The movement of protons back into the matrix through ATP synthase provides the energy needed for ATP synthesis, not the direct transfer of electrons or hydrolysis of ATP.
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