Final answer:
Cellulose is not made of protein; it is a complex carbohydrate that forms plant cell walls, whereas hair, muscle, and enzymes are all primarily composed of proteins.
Step-by-step explanation:
The component that is not made of protein among the options provided is c) cellulose. This is because cellulose is a complex carbohydrate, specifically a polysaccharide, which comprises the main structure of plant cell walls. On the other hand, hair, muscle, and enzymes are all primarily composed of proteins. For instance, hair is composed of a protein called keratin, muscles contain proteins such as myosins which facilitate contraction and movement, and enzymes are typically globular proteins that act as catalysts to speed up biochemical reactions.