Which of the following is a primary product of alcohol fermentation in yeast cells?

• A. Ethanol
• B. Acetyl-CoA
• C. Oxygen
• D. Lactic acid

Answer: (A)

Verified step by step guidance

1. Understand the process of alcohol fermentation: Alcohol fermentation is an anaerobic process carried out by yeast cells to produce energy in the absence of oxygen. It involves the conversion of glucose into ethanol and carbon dioxide.
2. Recall the key steps of alcohol fermentation: Glucose is first broken down into pyruvate through glycolysis. Pyruvate is then converted into acetaldehyde, releasing carbon dioxide. Finally, acetaldehyde is reduced to ethanol by the enzyme alcohol dehydrogenase.
3. Eliminate incorrect options: Acetyl-CoA is a molecule involved in aerobic respiration, not fermentation. Oxygen is not required in alcohol fermentation, as it is an anaerobic process. Lactic acid is produced during lactic acid fermentation, not alcohol fermentation.
4. Identify the correct product: Ethanol is the primary product of alcohol fermentation in yeast cells, along with carbon dioxide as a byproduct.
5. Conclude the reasoning: Based on the biochemical pathway of alcohol fermentation, ethanol is the correct answer to the question.