What are the differences between aerobic and anaerobic respiration? Name some organisms that use the anaerobic mode of respiration.
Differences between aerobic and anaerobic respiration:
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Presence of Oxygen: Aerobic respiration takes place in the presence of oxygen, whereas anaerobic respiration takes place in the absence of oxygen.
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Site of Process: In aerobic respiration, the breakdown of pyruvate using oxygen takes place in the mitochondria. In anaerobic respiration, the process occurs in the cytoplasm.
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Products Formed: Aerobic respiration breaks down glucose completely into carbon dioxide and water. Anaerobic respiration produces different products - in yeast, pyruvate is converted into ethanol and carbon dioxide, while in muscle cells (during lack of oxygen), it forms lactic acid.
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Energy Release: The release of energy in aerobic respiration is a lot greater than in anaerobic respiration.
Organisms using anaerobic respiration:
Yeast is an organism that uses the anaerobic mode of respiration during fermentation. Some other organisms also use pathways that do not involve oxygen to break down glucose.
Explanation
The answer is derived directly from the textbook context which explains that aerobic respiration uses oxygen to break down glucose completely into carbon dioxide and water in mitochondria, releasing more energy. Anaerobic respiration occurs without oxygen in the cytoplasm, producing ethanol and CO2 in yeast or lactic acid in muscles, with less energy release. The context explicitly mentions yeast as an organism using anaerobic respiration during fermentation.
Solution Steps
Step 1: Identify the key differences from context - presence/absence of oxygen, site of reaction, products formed, and energy released
Step 2: Extract examples of anaerobic organisms from context - yeast is explicitly mentioned
Step 3: Organize differences in a structured format suitable for 3-mark answer