Episomes are

Options

A. extranuclear part of Bacteria
B. toxins producing bodies
C. extranuclear components with least no. of genes
D. plasmids with ability to intergrate with bacterial chromosome

Answer

**Step-by-Step Solution:**

1. **Understanding Episomes**: Episomes are a type of genetic material found in bacteria. They are essentially plasmids, which are small, circular DNA molecules that exist independently of the chromosomal DNA.

2. **Characteristics of Episomes**:
- They are extra-chromosomal, meaning they exist outside the main bacterial chromosome.
- They have the ability to replicate independently.
- They can integrate into the bacterial chromosome, which allows them to be inherited during cell division.

3. **Analyzing the Options**:
- **Option 1: Extra nuclear part of bacteria**: This is incorrect because bacteria do not have a true nucleus; they have a nucleoid instead.
- **Option 2: Toxin-producing body**: This is also incorrect as episomes are not specifically related to toxin production.
- **Option 3: Extra nuclear component with least number of genes**: This is misleading since, while episomes are extra-chromosomal, they are not defined by having the least number of genes.
- **Option 4: Plasmid with ability to integrate with bacterial chromosomes**: This is the correct definition of episomes, as they are indeed plasmids that can integrate into the bacterial chromosome.

4. **Conclusion**: Therefore, the correct answer is that episomes are "plasmids with the ability to integrate with bacterial chromosomes."