1. Protein: This is the main component of an enzyme. It provides the specific shape and chemical environment necessary for the enzyme's catalytic activity.
2. Cofactor: This is a non-protein component that assists the enzyme in its function. Cofactors can be either:
* Inorganic ions: Examples include metal ions like zinc, magnesium, or iron.
* Organic molecules: These are called coenzymes. Examples include vitamins and NAD+ (nicotinamide adenine dinucleotide).
Note: While both components are important for enzyme function, some enzymes may only have a protein component and no cofactor.
