State whether the following statements are true or false.
Obligate anaerobes are killed by molecular oxygen.
A. True
B. False

Answer

To determine whether the statement "Obligate anaerobes are killed by molecular oxygen" is true or false, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Obligate Anaerobes**:
- Obligate anaerobes are organisms that can only survive in environments devoid of oxygen. They do not have the necessary mechanisms to tolerate or utilize oxygen.

2. **Impact of Oxygen on Obligate Anaerobes**:
- When exposed to molecular oxygen, obligate anaerobes cannot survive. The presence of oxygen is toxic to them, leading to their death.

3. **Comparison with Other Types of Anaerobes**:
- Unlike facultative anaerobes, which can survive in both the presence and absence of oxygen, obligate anaerobes strictly require an oxygen-free environment for survival.

4. **Conclusion**:
- Since obligate anaerobes are indeed killed by molecular oxygen, the statement is true.

### Final Answer:
A. True

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