Textbook Question
Compare and contrast fermentation as it occurs in your muscle cells and in yeast cells.
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8. Respiration
Fermentation & Anaerobic Respiration
Multiple Choice
The purpose of fermentation is to recycle which of the following molecules?
A
ATP
B
Glucose
C
Oxygen
D
NAD+
Verified step by step guidance1
Understand the context of fermentation: Fermentation is an anaerobic process that allows cells to produce energy without oxygen. It is crucial in regenerating molecules needed for glycolysis.
Identify the role of NAD+ in cellular respiration: During glycolysis, NAD+ is reduced to NADH as it accepts electrons. This is essential for the continuation of glycolysis, which produces ATP.
Recognize the problem of NAD+ depletion: In the absence of oxygen, the electron transport chain cannot operate, leading to a buildup of NADH and a shortage of NAD+.
Explain the purpose of fermentation: Fermentation pathways, such as lactic acid fermentation or alcoholic fermentation, oxidize NADH back to NAD+, allowing glycolysis to continue producing ATP.
Conclude the role of fermentation: The primary purpose of fermentation is to recycle NAD+ from NADH, ensuring a continuous supply of NAD+ for glycolysis, thus maintaining ATP production in anaerobic conditions.
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