Biology – Respiration | e-Consult
Respiration (1 questions)
Both yeast and mammalian muscle cells utilize anaerobic respiration to generate ATP when oxygen is absent. However, the specific processes and end products differ.
Yeast cells undergo alcoholic fermentation. Pyruvate is converted to ethanol and carbon dioxide. This process is carried out by yeast cells, such as Saccharomyces cerevisiae, and is used in the production of alcoholic beverages and bread. The end products are ethanol (CH3CH2OH) and carbon dioxide (CO2).
Mammalian muscle cells undergo lactate fermentation. Pyruvate is converted to lactate. This process occurs in muscle cells when oxygen supply is limited. The end product is lactate (CH3COO-). This process is essential for providing a quick source of ATP during intense exercise, although it is not sustainable for prolonged periods.
Here's a comparison table:
| Feature | Yeast (Alcoholic Fermentation) | Mammalian Muscle (Lactate Fermentation) |
| Organism | Saccharomyces cerevisiae | Mammalian muscle cells |
| Starting molecule | Pyruvate | Pyruvate |
| End Products | Ethanol, Carbon Dioxide | Lactate |
| Oxygen Requirement | Anaerobic | Anaerobic |
| Purpose | Production of alcohol, bread rising | Quick ATP production during intense exercise |