When a vector takes up foreign DNA segment then it is known as ?

Options

A. De-recombinant DNA
B. Hybrid DNA-RNA
C. Vector DNA
D. Recombinant vector DNA

Answer

To solve the question "When a vector takes up a foreign DNA segment, then it is known as?", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Concept of Vectors**:
- Vectors are DNA molecules used to deliver foreign genetic material into a host cell. They are essential tools in genetic engineering.

**Hint**: Recall that vectors are like delivery vehicles for DNA in genetic engineering.

2. **Foreign DNA Segment**:
- A foreign DNA segment refers to DNA that originates from a different organism or species. When this DNA is inserted into a vector, it allows for the study or manipulation of that DNA.

**Hint**: Think about what happens when DNA from one organism is introduced into another.

3. **Formation of Recombinant DNA**:
- When a vector incorporates foreign DNA, the resulting structure is referred to as recombinant DNA. This is because it combines DNA from two different sources.

**Hint**: Remember that "recombinant" means combining different genetic materials.

4. **Applications of Recombinant DNA**:
- Recombinant DNA technology is widely used in various fields such as medicine (for producing insulin), agriculture (for creating genetically modified organisms), and research.

**Hint**: Consider the practical uses of recombinant DNA in various industries.

5. **Identifying the Correct Term**:
- Among the options provided, the term that accurately describes a vector that has taken up foreign DNA is "recombinant DNA". Other terms like "Hybrid DNA" or "Vector DNA" are not standard terms used in this context.

**Hint**: Focus on the terminology commonly used in genetics to identify the correct answer.

### Final Answer:
When a vector takes up a foreign DNA segment, it is known as **recombinant DNA**.