Multiple Choice
Which compounds donate electrons to the electron transport chain during cellular respiration?
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8. Respiration
Electron Transport Chain
Multiple Choice
What is the primary role of the electron transport chain in cellular respiration?
A
To break down fatty acids into acetyl-CoA
B
To synthesize ribosomes for protein production
C
To generate a proton gradient across the inner mitochondrial membrane for ATP synthesis
D
To directly convert glucose into pyruvate
Verified step by step guidance1
Understand the context of cellular respiration: Cellular respiration is the process by which cells generate energy in the form of ATP by breaking down glucose and other molecules. It consists of three main stages: glycolysis, the citric acid cycle, and oxidative phosphorylation.
Focus on oxidative phosphorylation: This stage occurs in the mitochondria and involves the electron transport chain (ETC) and chemiosmosis. The ETC is a series of protein complexes embedded in the inner mitochondrial membrane.
Learn the role of the electron transport chain: The ETC transfers electrons from electron carriers (NADH and FADH2) to oxygen through a series of redox reactions. This process releases energy that is used to pump protons (H⁺) across the inner mitochondrial membrane, creating a proton gradient.
Understand the significance of the proton gradient: The proton gradient establishes a difference in proton concentration and electrical charge across the membrane. This gradient is a form of potential energy, which drives ATP synthesis when protons flow back into the mitochondrial matrix through ATP synthase.
Clarify the correct answer: The primary role of the electron transport chain is to generate a proton gradient across the inner mitochondrial membrane, which is essential for ATP synthesis during cellular respiration.
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