Which of the following is CORRECTLY matched ?

Options

A. Agrobacterium tumefaciens - tumor
B. Thermus aquaticus - Bt - gene
C. pBR 322 - enzyme
D. Ligase - molecular scissor

Answer

To solve the question "Which of the following is CORRECTLY matched?", we will analyze each option provided:

1. **Agrobacterium tumefaciens - Tumor**
- Agrobacterium tumefaciens is a bacterium known for causing crown gall disease in plants, which is characterized by tumor formation. This option is correctly matched.

2. **Thermus aquaticus - Bt gene**
- Thermus aquaticus is a thermophilic bacterium used primarily in the Polymerase Chain Reaction (PCR) due to its heat-resistant DNA polymerase. It does not have the Bt gene, which is associated with Bacillus thuringiensis, a bacterium used for pest control. Therefore, this option is incorrectly matched.

3. **PVR-322 - Enzyme**
- PVR-322 is not an enzyme; it is a plasmid used in plant genetic engineering. Therefore, this option is also incorrectly matched.

4. **Ligase - Molecular scissor**
- Ligase is an enzyme that facilitates the joining of two large molecules, typically DNA strands, by forming a chemical bond. It is not a "molecular scissor," which refers to restriction enzymes that cut DNA. Hence, this option is incorrectly matched.

After analyzing all the options, we conclude that the only correctly matched pair is:

**Correct Answer:** Agrobacterium tumefaciens - Tumor