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In the process of alcohol fermentation, triose phosphate serves as the electron donor, while acetaldehyde acts as the electron acceptor.

1. (a) The energy production in aerobic respiration (36 ATP) is 18 times greater than that in anaerobic respiration (2 ATP).
2. (b) Enzyme activity can be reversibly inhibited by substrate analogues in competitive inhibition.
3. (c) Fermentation is the breakdown of organic substances without oxygen, mediated by enzymes, producing alcohol, organic acids, gases, etc.
4. (d) The final products of fermentation include ethanol, lactic acid, and carbon dioxide.

Correct answer: (c) Fermentation is the breakdown of organic substances without oxygen, mediated by enzymes, producing alcohol, organic acids, gases, etc.

Solution

The statement about triose phosphate donating electrons to acetaldehyde is a detail of alcohol fermentation, but the matching option is the one that correctly defines fermentation in general. Fermentation is an anaerobic, enzyme-mediated breakdown of organic compounds that yields products such as alcohol, organic acids, and gases.

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