(a) is the extrachromosomal DNA present in (b) of prokaryotic cell.

Options

A. (a) Mesosome (b) Plasmamembrane
B. (a) Mesosome (b) Cell wall
C. (a) Plasmid (b) Nucleus
D. (a) Plasmid (b) Cytoplasm

Answer

To solve the question, we need to identify the extrachromosomal DNA present in prokaryotic cells and where it is located.

### Step-by-Step Solution:

1. **Understanding Prokaryotic Cells**:
- Prokaryotic cells include organisms such as bacteria and archaea. They do not have a membrane-bound nucleus, and their genetic material is not enclosed within a nucleus.

2. **Identifying Extrachromosomal DNA**:
- In prokaryotic cells, the genetic material consists of a circular chromosome located in a region called the nucleoid. However, there is also additional DNA that exists outside of this main chromosome.

3. **Defining Extrachromosomal DNA**:
- The extrachromosomal DNA in prokaryotic cells is known as plasmids. Plasmids are small, circular DNA molecules that can replicate independently of the chromosomal DNA.

4. **Location of Plasmids**:
- Plasmids are found in the cytoplasm of prokaryotic cells. They are not associated with the plasma membrane or the cell wall, but rather float freely in the cytoplasmic environment.

5. **Final Answer**:
- Therefore, the answer to the question is:
- (a) Plasmid
- (b) Cytoplasm

### Conclusion:
The correct answer is: **A plasmid B cytoplasm**.

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