Multiple Choice
The mobile electron carriers of the ETC are:
21. The Generation of Biochemical Energy
Electron Transport Chain
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Protons are pumped into the intermembrane space due to:
A
Energy provided by the electrons as they pass through complexes I, III & IV.
B
Decreasing of the pH in the intermembrane space.
C
CoQ pumping electrons through the complexes.
D
Formation of water from final electron acceptor.
Verified step by step guidance1
Understand the context: This problem is related to the electron transport chain in cellular respiration, specifically the process of oxidative phosphorylation.
Identify the role of protons: In the electron transport chain, protons (H⁺ ions) are pumped from the mitochondrial matrix into the intermembrane space, creating a proton gradient.
Recognize the source of energy: The energy required to pump protons across the membrane is provided by electrons as they move through complexes I, III, and IV of the electron transport chain.
Consider the effect on pH: As protons accumulate in the intermembrane space, the pH decreases due to increased acidity, which is a consequence of the proton gradient.
Clarify the role of CoQ and water formation: Coenzyme Q (CoQ) transfers electrons between complexes but does not directly pump protons. Water formation occurs when electrons are finally accepted by oxygen, but this is not directly related to proton pumping.
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