Describe the role of `CaCl_(2)` in the preparation of competent cells?

Explanation

**Step-by-Step Text Solution:**

1. **Introduction to Competent Cells:**
Competent cells are bacterial cells that have been treated to allow them to take up foreign DNA, such as plasmids, during a process called transformation.

2. **Role of Calcium Chloride (CaCl₂):**
Calcium chloride is commonly used in the preparation of competent cells. Its primary role is to enhance the efficiency of DNA uptake by the bacterial cells.

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