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The antibiotic resistance gene can be us...

The antibiotic resistance gene can be used as a ……… marker for selecting transformants.

A

selectable

B

differential

C

similar

D

radioactive

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**Step-by-Step Solution:** 1. **Understanding the Question**: The question asks about the role of the antibiotic resistance gene in selecting transformants. Transformants are organisms that have successfully taken up foreign DNA. 2. **Identifying the Role of Antibiotic Resistance Genes**: Antibiotic resistance genes are used in biotechnology to identify which cells have successfully incorporated the foreign DNA. These genes provide a means to select for those cells that have undergone transformation. 3. **Defining Selectable Markers**: A selectable marker is a gene that confers resistance to an antibiotic, allowing for the identification of cells that have been successfully transformed. Only those cells that have taken up the plasmid containing the antibiotic resistance gene will survive in the presence of the antibiotic. 4. **Examples of Antibiotics**: Common antibiotics used in this context include ampicillin, penicillin, and tetracycline. Cells that have the antibiotic resistance gene will be able to grow in media containing these antibiotics, while non-transformed cells will not. 5. **Conclusion**: Therefore, the antibiotic resistance gene can be used as a **selectable marker** for selecting transformants. **Final Answer**: The antibiotic resistance gene can be used as a **selectable marker** for selecting transformants. ---
**Step-by-Step Solution:** 1. **Understanding the Question**: The question asks about the role of the antibiotic resistance gene in selecting transformants. Transformants are organisms that have successfully taken up foreign DNA. 2. **Identifying the Role of Antibiotic Resistance Genes**: Antibiotic resistance genes are used in biotechnology to identify which cells have successfully incorporated the foreign DNA. These genes provide a means to select for those cells that have undergone transformation. 3. **Defining Selectable Markers**: A selectable marker is a gene that confers resistance to an antibiotic, allowing for the identification of cells that have been successfully transformed. Only those cells that have taken up the plasmid containing the antibiotic resistance gene will survive in the presence of the antibiotic. ...
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