For transformation, micro-particles coated with DNA to be bombarded from gene gun are made up of
(a) silver or platium
(b) platinum or zinc
(c) silicon or platinum
(d) gold or tungsten

Options

A. silver or platium
B. platinum or zinc
C. silicon or platinum
D. gold or tungsten

Answer

To solve the question regarding the materials used for micro-particles coated with DNA in the gene gun transformation method, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Process of Transformation**:
- Transformation is a method used to introduce foreign DNA into a cell. This can be achieved through various techniques, one of which is the biolistic method, commonly referred to as the gene gun method.

2. **Identify the Gene Gun Method**:
- The gene gun method involves using micro-particles that are coated with DNA. These particles are then accelerated and shot into the target cells at high velocity.

3. **Determine the Material of Micro-particles**:
- The micro-particles used in the gene gun method need to be dense enough to penetrate the cell membrane. Common materials used for this purpose are heavy metals.

4. **Evaluate the Options Provided**:
- (a) Silver or platinum
- (b) Platinum or zinc
- (c) Silicon or platinum
- (d) Gold or tungsten

5. **Select the Correct Option**:
- Among the options, gold and tungsten are known to be the materials used for the micro-particles in the gene gun method. They are heavy and can effectively penetrate the cell walls when accelerated.

6. **Conclusion**:
- Therefore, the correct answer is (d) gold or tungsten.

### Final Answer:
(d) gold or tungsten