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Multiple Choice
In lactic acid fermentation, which molecule acts as the electron acceptor from NADH?
A
Ethanol
B
Acetaldehyde
C
Oxygen
D
Pyruvate
Verified step by step guidance
1
Understand the context of lactic acid fermentation: It is an anaerobic process where glucose is converted into cellular energy and the metabolite lactate.
Identify the role of NADH in the process: During glycolysis, glucose is broken down, and NAD+ is reduced to NADH, which needs to be oxidized back to NAD+ to continue glycolysis.
Recognize the need for an electron acceptor: In the absence of oxygen, another molecule must accept electrons from NADH to regenerate NAD+.
Identify pyruvate as the electron acceptor: In lactic acid fermentation, pyruvate accepts electrons from NADH, converting it into lactate and regenerating NAD+.
Conclude the process: The conversion of pyruvate to lactate allows glycolysis to continue by ensuring a supply of NAD+, which is crucial for the production of ATP in anaerobic conditions.