Multiple Choice
Where does the electron transport chain occur in eukaryotic cells?
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8. Respiration
Electron Transport Chain
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What is the primary purpose of the electron transport chain in cellular respiration?
A
To directly convert glucose into energy
B
To produce oxygen as a byproduct
C
To create a proton gradient for ATP synthesis
D
To generate ATP by substrate-level phosphorylation
Verified step by step guidance1
Understand the role of the electron transport chain (ETC) in cellular respiration. The ETC is a series of protein complexes located in the inner mitochondrial membrane.
Recognize that the primary purpose of the ETC is to transfer electrons from electron donors like NADH and FADH2 to electron acceptors such as oxygen, through a series of redox reactions.
Learn that as electrons move through the ETC, energy is released and used to pump protons (H⁺ ions) across the mitochondrial membrane, creating a proton gradient.
Understand that this proton gradient generates a potential energy difference across the membrane, known as the proton motive force.
Realize that the proton motive force drives ATP synthesis by allowing protons to flow back into the mitochondrial matrix through ATP synthase, a process known as chemiosmosis.
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