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A gene whose expression helps to indenti...

A gene whose expression helps to indentify transformed cell is known as

A

Selectable marker

B

Vector

C

Plasmid

D

Structural gene

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**Step-by-Step Solution:** 1. **Understanding the Question**: The question asks for a specific type of gene that helps in identifying transformed cells. This is a key concept in biotechnology, particularly in genetic engineering. 2. **Identifying Key Terms**: The term "transformed cell" refers to a cell that has incorporated foreign DNA through a process called transformation. The ability to identify these cells is crucial in biotechnology. 3. **Concept of Selectable Markers**: In recombinant DNA technology, selectable markers are genes that confer a trait suitable for artificial selection. They are used to differentiate between cells that have taken up the foreign DNA (transformed cells) and those that have not (non-transformed cells). 4. **Function of Selectable Markers**: Selectable markers usually provide resistance to antibiotics or the ability to synthesize a nutrient that the host organism cannot produce on its own. For example, a gene that provides resistance to an antibiotic can be used to select for cells that have successfully taken up the plasmid containing that gene. 5. **Conclusion**: Based on the understanding of selectable markers and their role in identifying transformed cells, we conclude that the answer to the question is "selectable marker." **Final Answer**: A gene whose expression helps to identify transformed cells is known as a **selectable marker**. ---
**Step-by-Step Solution:** 1. **Understanding the Question**: The question asks for a specific type of gene that helps in identifying transformed cells. This is a key concept in biotechnology, particularly in genetic engineering. 2. **Identifying Key Terms**: The term "transformed cell" refers to a cell that has incorporated foreign DNA through a process called transformation. The ability to identify these cells is crucial in biotechnology. 3. **Concept of Selectable Markers**: In recombinant DNA technology, selectable markers are genes that confer a trait suitable for artificial selection. They are used to differentiate between cells that have taken up the foreign DNA (transformed cells) and those that have not (non-transformed cells). ...
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