Multiple Choice
In the context of redox reactions, what species accepts electrons in the final step of the electron transport chain?
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6. Chemical Quantities & Aqueous Reactions
Redox Reactions
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Which of the following is a common electron acceptor in catabolic reactions?
A
ATP
B
FADH2
C
Glucose
D
NAD+
Verified step by step guidance1
Understand the role of electron acceptors in catabolic reactions: In catabolic reactions, molecules are broken down to release energy, and electrons are transferred to electron acceptors.
Identify the common electron acceptors: In biological systems, common electron acceptors include NAD+ (Nicotinamide adenine dinucleotide) and FAD (Flavin adenine dinucleotide).
Analyze the options given: ATP is primarily an energy carrier, not an electron acceptor. FADH2 is a reduced form of FAD, meaning it has already accepted electrons. Glucose is a substrate that is broken down, not an electron acceptor.
Recognize the role of NAD+: NAD+ is a common electron acceptor in catabolic reactions, where it accepts electrons and becomes reduced to NADH.
Conclude that NAD+ is the correct answer as it is the molecule that accepts electrons during catabolic reactions, facilitating the release of energy.
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