Respiratory enzymes are found associated with plasma membrane in

Options

A. Clostridium
B. Chlorella
C. Chara
D. Chlamydomonas

Answer

To solve the question "Respiratory enzymes are found associated with plasma membrane in", we need to analyze the options provided and understand the characteristics of the organisms listed.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks where respiratory enzymes are found associated with the plasma membrane. We need to identify which of the given options is a prokaryote, as respiratory enzymes are typically associated with the plasma membrane in prokaryotic organisms.

2. **Identifying the Options**:
- **Clostridium**: This is a genus of bacteria, which are prokaryotes. Prokaryotes lack membrane-bound organelles and have respiratory enzymes associated with their plasma membrane.
- **Chlorella**: This is a genus of green algae, which are eukaryotic organisms. Eukaryotes have membrane-bound organelles such as mitochondria where respiratory enzymes are located, not in the plasma membrane.
- **Chara**: This is also a genus of green algae and is eukaryotic. Like Chlorella, it does not have respiratory enzymes associated with the plasma membrane.
- **Chlamydomonas**: This is another genus of green algae and is also eukaryotic. Similar to the other two, it does not have respiratory enzymes associated with the plasma membrane.

3. **Analyzing the Characteristics**:
- **Prokaryotes**: In prokaryotes like Clostridium, respiratory enzymes are found in structures called mesosomes, which are invaginations of the plasma membrane.
- **Eukaryotes**: In eukaryotes like Chlorella, Chara, and Chlamydomonas, respiratory enzymes are found in mitochondria or the cytoplasm, not associated with the plasma membrane.

4. **Conclusion**: Based on the analysis, the only organism from the options that is a prokaryote and has respiratory enzymes associated with the plasma membrane is **Clostridium**.

### Final Answer:
**Clostridium**