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

Options

A. Selectable marker
B. Vector
C. plasmid
D. Structural gene

Explanation

To solve the question, "A gene whose expression helps to identify transformed cell is known as", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: We need to identify a specific type of gene that plays a role in recognizing or identifying transformed cells. Transformed cells are typically those that have taken up foreign DNA, often through genetic engineering techniques.

2. **Analyzing the Options**:
- **Option A: Selectable Marker**: This is a gene that allows for the identification of cells that have been successfully transformed. It usually confers a trait that can be easily selected for, such as antibiotic resistance or the ability to grow in a specific medium.
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