What is prosthetic group?

Explanation

**Step-by-Step Solution:**

1. **Definition of Prosthetic Group**: A prosthetic group is defined as a non-protein component that is tightly and permanently attached to a protein.

2. **Role in Proteins**: Prosthetic groups play a crucial role in the function of the protein they are associated with. They can be involved in various biochemical processes, such as catalysis or electron transfer.

3. **Examples of Prosthetic Groups**: Common examples include heme in hemoglobin, which is essential for oxygen transport, and flavin in certain enzymes that are involved in redox reactions.

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