Apoenzyme alone cannot function.

Explanation

### Step-by-Step Solution:

1. **Understanding Enzymes**: Enzymes are biological catalysts that speed up chemical reactions in living organisms. They are primarily proteins made up of one or more polypeptide chains.

2. **Definition of Apoenzyme**: The term "apoenzyme" refers to the protein part of an enzyme. It is the inactive form of the enzyme, which requires additional components to become active.

3. **Role of Cofactors**: Apoenzymes often require non-protein components called cofactors to function. These cofactors can be:
- **Prosthetic Groups**: Tightly bound organic compounds.
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