Multiple Choice
Which of the following is not a complex of the electron transport chain?
11. Aerobic Respiration
Electron Transport
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Which of the following is the correct order of electrons through the electron chain?
A
NADH dehydrogenase → succinate dehydrogenase → Cytochrome oxidase → Cytochrome bc1
B
succinate dehydrogenase → NADH dehydrogenase → Cytochrome oxidase → Cytochrome bc1
C
NADH dehydrogenase → succinate dehydrogenase → Cytochrome bc1 → Cytochrome oxidase
D
Cytochrome bc1 → succinate dehydrogenase → Cytochrome oxidase → NADH dehydrogenase
Verified step by step guidance1
Understand the context: The electron transport chain (ETC) is a series of protein complexes located in the inner mitochondrial membrane that transfer electrons from electron donors to electron acceptors via redox reactions.
Identify the main complexes involved in the ETC: The key complexes are Complex I (NADH dehydrogenase), Complex II (succinate dehydrogenase), Complex III (Cytochrome bc1), and Complex IV (Cytochrome oxidase).
Determine the order of electron flow: Electrons from NADH enter the chain at Complex I, while electrons from FADH2 enter at Complex II. Both pathways converge at Complex III.
Recognize the sequence: Electrons move from Complex I to Complex III via ubiquinone (Q), and from Complex II to Complex III. From Complex III, electrons are transferred to Complex IV via cytochrome c.
Conclude the correct order: Based on the flow of electrons through the complexes, the correct sequence is NADH dehydrogenase → succinate dehydrogenase → Cytochrome bc1 → Cytochrome oxidase.
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