What is a prosthetic group ?

Explanation

### Step-by-Step Text Solution

1. **Definition of Prosthetic Group**: A prosthetic group is a non-amino acid component that is part of the structure of certain proteins known as conjugated proteins or heteroproteins.

2. **Characteristics**: Prosthetic groups are tightly bound to the proteins. They are not easily removed and are essential for the protein's function.

3. **Binding**: The binding of prosthetic groups to proteins occurs through covalent bonds. This strong attachment ensures that the prosthetic group remains associated with the protein during its biological activity.

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