In bacteria the site for respiratory activity is found in

Options

A. Plasmid
B. Episome
C. Mesosome
D. Nucleoid.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks where the site for respiratory activity is found in bacteria. We need to evaluate the given options: plasmid, epizome, mesosome, and nucleoid.

2. **Evaluating the Options**:
- **Plasmid**: Plasmids are small, circular DNA molecules found in bacteria. They are primarily involved in antibiotic resistance and do not play a role in respiratory activity. Therefore, plasmid is not the correct answer.

- **Epizome**: An epizome is a type of plasmid that can replicate independently of the chromosomal DNA. It carries genetic material but is not associated with respiratory functions. Thus, epizome is also not the correct answer.

- **Mesosome**: Mesosomes are invaginations (folded structures) of the bacterial cell membrane. They increase the surface area of the membrane and are involved in various cellular processes, including respiration. Therefore, mesosome is likely to be the correct answer.

- **Nucleoid**: The nucleoid is a region in a bacterial cell that contains the genetic material (DNA). It is not involved in respiratory activity, making nucleoid an incorrect option.

3. **Conclusion**: After evaluating all the options, the correct answer is **mesosome**. Mesosomes serve as the site for respiratory activity in bacteria.

**Final Answer**: In bacteria, the site for respiratory activity is found in **mesosomes**.

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