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Multiple Choice
Which of the following molecules can donate electrons in metabolic reactions?
A
H2O
B
NADH
C
CO2
D
ATP
Verified step by step guidance
1
Identify the role of each molecule in metabolic reactions: H2O, NADH, CO2, and ATP.
Understand that electron donation in metabolic reactions is typically associated with redox reactions, where a molecule donates electrons to another molecule.
Recognize that NADH is a well-known electron carrier in cellular respiration, specifically in the electron transport chain, where it donates electrons.
Consider the chemical structure and function of NADH: it contains a nicotinamide ring that can undergo oxidation, losing electrons and thus acting as an electron donor.
Conclude that among the given options, NADH is the molecule that can donate electrons in metabolic reactions, as it is specifically involved in redox processes.