Multiple Choice
Does the electron transport chain (ETC) require oxygen to function effectively?
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8. Respiration
Electron Transport Chain
Multiple Choice
What is the primary function of the electron transport chain in cellular respiration?
A
To pump protons across the mitochondrial membrane to create a proton gradient
B
To synthesize glucose from carbon dioxide and water
C
To generate ATP directly from glucose
D
To break down fatty acids into acetyl-CoA
Verified step by step guidance1
Understand the context of cellular respiration: Cellular respiration is a process by which cells convert biochemical energy from nutrients into adenosine triphosphate (ATP), and then release waste products.
Identify the role of the electron transport chain (ETC): The ETC is the final stage of cellular respiration, occurring in the inner mitochondrial membrane, where electrons are transferred through a series of complexes.
Recognize the primary function of the ETC: The main function is to pump protons (H⁺ ions) across the mitochondrial membrane, creating a proton gradient. This gradient is essential for ATP synthesis.
Clarify the mechanism: As electrons move through the ETC, energy is released and used to transport protons from the mitochondrial matrix to the intermembrane space, establishing a proton gradient.
Connect to ATP synthesis: The proton gradient drives ATP synthesis through chemiosmosis, where protons flow back into the matrix via ATP synthase, facilitating the conversion of ADP to ATP.
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