Yeast cells can be immobilised in

Options

A. Silica gel
B. Calcium alginate
C. Porcelain column
D. Encapsulation

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the medium in which yeast cells can be immobilized. Immobilization refers to the process of confining cells in a specific location, allowing them to remain active while being separated from the surrounding environment.

2. **Analyzing the Options**: The options given are:
- Silica gel
- Calcium alginate
- Procalin column
- Encapsulation

3. **Identifying the Correct Option**:
- **Silica Gel**: While silica gel is used in various applications, it is not typically used for immobilizing yeast cells.
- **Calcium Alginate**: This is a gel-like substance derived from alginic acid, which is known for its ability to immobilize cells, including yeast. It provides a suitable environment for yeast to remain active while being immobilized.
- **Procalin Column**: This is not a standard term in the context of yeast immobilization.
- **Encapsulation**: While encapsulation can refer to a method of immobilizing cells, it is not a specific medium like calcium alginate.

4. **Conclusion**: Based on the analysis, the best option for immobilizing yeast cells is **Calcium Alginate**. This medium allows yeast cells to remain viable and can be used in processes such as fermentation for alcohol production.

5. **Final Answer**: Yeast cells can be immobilized in **Calcium Alginate**.