For transformation, micro- particles coated with DNA to be bombarded with gene gun are made up of

Options

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

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the composition of micro-particles that are coated with DNA and used in a gene gun for transformation.

2. **Identifying the Technique**: The gene gun technique is also known as biolistic particle delivery or particle bombardment. This method was developed in the 1980s and is crucial for genetic engineering.

3. **Function of the Gene Gun**: The gene gun delivers DNA or RNA by coating it onto microscopic particles which are then accelerated into living tissues at high velocity.

4. **Materials Used**: The particles used in this technique are typically made of specific metals that can effectively carry the DNA into the target cells. The common materials mentioned include gold and tungsten.

5. **Selecting the Correct Option**: Among the options provided (silver and platinum, zinc and silicon, platinum and gold, tungsten), the correct answer is gold or tungsten, as these are the materials known to be used for the micro-particles in gene guns.

6. **Conclusion**: Therefore, the micro-particles coated with DNA that are bombarded with the gene gun are made up of **gold or tungsten**.