Proteins are

Options

A. Macromolecules
B. Homopolymers
C. Micromolecules
D. Polymers of starch

Answer

### Step-by-Step Solution:

1. **Understanding Proteins**:
- Proteins are large and complex molecules that play critical roles in the body. They are essential for various biological functions.

2. **Composition of Proteins**:
- Proteins are made up of smaller units called amino acids. There are 20 different amino acids that can combine in various sequences to form proteins.

3. **Classification of Proteins**:
- Proteins are classified as **macromolecules** because they are large molecules made up of many smaller units (amino acids).

4. **Homopolymers vs. Heteropolymers**:
- A **homopolymer** is a polymer made up of only one type of monomer. In contrast, proteins are **heteropolymers** because they are made from different types of amino acids.

5. **Correct Answer**:
- Among the options provided:
- **Macromolecules**: Correct, as proteins are large molecules.
- **Homopolymers**: Incorrect, as proteins are made from different amino acids.
- **Micromolecules**: Incorrect, as proteins are large.
- **Polymer of the stars**: Incorrect, as proteins are polymers of amino acids, not related to stars.

6. **Conclusion**:
- The correct classification of proteins is that they are **macromolecules**.