After transformation process is completed antibiotics are added to the culutre medium to select the desired transformed bacteria. Such an antibiotic resistance gene is described as :

Options

A. Molecular seissor
B. Palindrome sequence
C. Selectable marker
D. Ori site

Answer

To answer the question regarding the antibiotic resistance gene used to select transformed bacteria after the transformation process, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Transformation**: The transformation process involves introducing foreign DNA into a bacterial cell. This allows the bacteria to acquire new traits, such as antibiotic resistance.

2. **Role of Antibiotics**: After transformation, antibiotics are added to the culture medium. The purpose of adding antibiotics is to select for bacteria that have successfully taken up the foreign DNA, which typically includes an antibiotic resistance gene.

3. **Identifying Transformed vs. Non-Transformed Bacteria**: The transformed bacteria will possess the antibiotic resistance gene, allowing them to survive in the presence of the antibiotic. In contrast, non-transformed bacteria, which do not have the resistance gene, will be killed by the antibiotic.

4. **Selectable Marker**: The antibiotic resistance gene serves as a "selectable marker." This term refers to a gene that enables the identification of cells that have successfully incorporated the foreign DNA. In this case, the selectable marker is the antibiotic resistance gene.

5. **Conclusion**: Therefore, the antibiotic resistance gene that allows for the selection of transformed bacteria is described as a **selectable marker**.

### Final Answer:
The antibiotic resistance gene is described as a **selectable marker**.

---