What is pyruvate broken down to in yeast?
Correct answer: B. Alcohol
- A. Acetyl CoA
- B. Alcohol
- C. Lactic acid
- D. All of these options are correct
Explanation
In yeast and other microorganisms during fermentation, pyruvate is typically broken down into ethanol (ethyl alcohol) and carbon dioxide through a process called alcoholic fermentation. This is a way for yeast to generate ATP (energy) in the absence of oxygen. During this process, pyruvate, which is a three-carbon compound, is converted into ethanol, a two-carbon alcohol, and carbon dioxide is released as a byproduct. This fermentation process is utilised in the production of alcoholic beverages and also plays a role in the rising of bread dough when yeast ferments sugars in the absence of oxygen.
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About Bioenergetics
Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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