Cloning vector contains

Options

A. DNA
B. RNA
C. DNA and RNA
D. DNA and Proteins

Answer

### Step-by-Step Solution:

1. **Understanding Cloning Vectors**:
- Cloning vectors are tools used to introduce foreign DNA into a host organism. They are essential in recombinant DNA technology for producing various biotechnological products.

2. **Types of Cloning Vectors**:
- The two main types of cloning vectors are plasmids and bacteriophages.
- **Plasmids**: These are small, circular pieces of DNA that exist independently of chromosomal DNA in bacteria. They replicate autonomously and can carry foreign DNA.
- **Bacteriophages**: These are viruses that infect bacteria and can also be used to deliver foreign DNA into bacterial cells.

3. **Components of Cloning Vectors**:
- Cloning vectors typically contain several key features:
- **Origin of Replication (ori)**: This allows the vector to replicate within the host cell.
- **Selectable Marker Genes**: These genes help in identifying which cells have taken up the vector. Common markers include antibiotic resistance genes.
- **Multiple Cloning Site (MCS)**: This is a region containing several restriction enzyme sites where foreign DNA can be inserted.

4. **Functionality of Cloning Vectors**:
- Cloning vectors facilitate the insertion of foreign DNA, allow for the selection of recombinant cells, and enable the amplification of the inserted DNA within the host organism.

5. **Conclusion**:
- A cloning vector primarily contains DNA (either plasmid or bacteriophage DNA) that is used to carry and replicate foreign genes in a host organism.

### Final Answer:
A cloning vector contains **DNA**.

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