The products of anaerobic respiration are

Question

BlackTom AI · Accepted Answer

Anaerobic pathways convert glucose without oxygen, so their end-products are fermentation products such as lactic acid or ethanol plus carbon dioxide.

Relevant knowledge points and concepts:
- Glycolysis first breaks glucose (C6H12O6) into 2 pyruvate molecules, producing a net 2 ATP and 2 NADH.
- Without O2 to accept electrons, cells must reoxidize NADH to NAD+ by reducing pyruvate; this yields fermentation products.
- Two common fermentations: lactic acid fermentation (animals, some bacteria) and alcoholic fermentation (yeast, some microorganisms).

Step-by-step reasoning and reactions:
1. Glycolysis: C6H12O6 → 2 pyruvate + 2 ATP + 2 NADH.
2. Lactic acid fermentation (in muscle/bacteria): 2 pyruvate + 2 NADH → 2 lactate (2 CH3CH(OH)COOH) + 2 NAD+. Net equation: C6H12O6 → 2 CH3CH(OH)COOH + 2 ATP.
3. Alcoholic fermentation (in yeast): 2 pyruvate → 2 acetaldehyde + 2 CO2; then 2 acetaldehyde + 2 NADH → 2 ethanol (2 C2H5OH) + 2 NAD+. Net equation: C6H12O6 → 2 C2H5OH + 2 CO2 + 2 ATP.

Why option a is correct:
- Option a lists lactic acid, ethyl (ethyl = ethanol) alcohol and carbon dioxide — these are the characteristic products of anaerobic fermentation pathways (lactate from lactic fermentation; ethanol + CO2 from alcoholic fermentation). The question is asking for products of anaerobic respiration in general, so listing these fermentation products is appropriate.

Why option b is incorrect:
- Option b (carbon dioxide and water) are the main end-products of aerobic respiration (complete oxidation in mitochondria), not anaerobic respiration. Aerobic respiration: C6H12O6 + 6 O2 → 6 CO2 + 6 H2O + ~30–32 ATP.

Conclusion:
Therefore the correct answer is option a (Lactic acid, ethyl alcohol and carbon dioxide), which matches the provided answer.

The products of anaerobic respiration are单项选择题

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