Joining of repeating units to form a macromoleule is called

Options

A. Polymerisation
B. Aggregation
C. Polymorphism
D. Condensation.

Answer

To answer the question "Joining of repeating units to form a macromolecule is called," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Terms**:
- The question refers to the process of joining smaller units to create a larger structure. The smaller units are known as monomers.

2. **Identifying Monomers and Polymers**:
- When monomers (the repeating units) join together, they form a larger molecule known as a polymer.

3. **Defining the Process**:
- The specific process of joining these monomers to form a polymer is called polymerization.

4. **Examples of Macromolecules**:
- A common example of a macromolecule is cellulose, which is a polymer made up of many beta-glucose units linked together.

5. **Choosing the Correct Answer**:
- Based on the definition and examples provided, the correct term for the joining of repeating units to form a macromolecule is "polymerization."

### Final Answer:
The joining of repeating units to form a macromolecule is called **polymerization**.

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