In aerobic cellular respiration, which generates more ATP -

Options

A. Subtrate level phosphorylation
B. Chemiosmosis
C. Both generate the same amount of ATP
D. Neither generates ATP

Answer

### Step-by-Step Solution:

1. **Understanding Aerobic Cellular Respiration**:
- Aerobic cellular respiration is a multi-step process that includes glycolysis, the link reaction, the Krebs cycle, and oxidative phosphorylation.

2. **Identifying ATP Generation Methods**:
- There are two main methods of ATP generation during aerobic respiration:
- **Substrate-level phosphorylation**: This occurs during glycolysis and the Krebs cycle, where ATP is produced directly from the energy released in the reactions.
- **Oxidative phosphorylation**: This occurs in the electron transport chain (ETS) and is driven by a proton gradient created by the movement of electrons through the chain.

3. **Comparing ATP Yield**:
- Substrate-level phosphorylation generates a small amount of ATP (approximately 7% of total ATP).
- Oxidative phosphorylation, which involves the electron transport chain and chemiosmosis, generates the majority of ATP (approximately 93% of total ATP).

4. **Conclusion**:
- Therefore, oxidative phosphorylation generates significantly more ATP compared to substrate-level phosphorylation in aerobic cellular respiration.

### Final Answer:
In aerobic cellular respiration, oxidative phosphorylation generates more ATP than substrate-level phosphorylation.

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