Which is not a macromolecule

Options

A. Cellulose
B. DNA
C. Glycogen
D. None of the above.

Answer

To determine which option is not a macromolecule, we need to first understand what macromolecules are and then analyze each option provided.

### Step-by-Step Solution:

1. **Define Macromolecules**:
- Macromolecules are large molecules that are typically composed of thousands of atoms. They are often polymers, meaning they are made up of repeating units (monomers). Common examples include proteins, nucleic acids, carbohydrates, and lipids.

2. **Analyze Each Option**:
- **Cellulose**:
- Cellulose is a polysaccharide made up of long chains of glucose units. It is a structural component of the plant cell wall. Since it is a polymer, cellulose is classified as a macromolecule.

- **DNA**:
- DNA (deoxyribonucleic acid) is a nucleic acid that carries genetic information. It is composed of long chains of nucleotides, making it a polymer. Thus, DNA is also a macromolecule.

- **Glycogen**:
- Glycogen is a polysaccharide that serves as a form of energy storage in animals. It is also made up of glucose units, similar to cellulose, and is classified as a macromolecule.

3. **Conclusion**:
- All the options provided (cellulose, DNA, and glycogen) are macromolecules. Therefore, the correct answer to the question "Which is not a macromolecule?" is "none of the above," as all listed options are indeed macromolecules.

### Final Answer:
- **None of the above** is not a macromolecule, as all the options listed (cellulose, DNA, glycogen) are macromolecules.