The non-protein material present in a conjugated protein is called ........

Explanation

**Step-by-Step Solution:**

1. **Understanding Conjugated Proteins**: Conjugated proteins are complex molecules that consist of both protein and non-protein components. The protein part is known as the apoprotein.

2. **Identifying the Non-Protein Component**: The non-protein material in a conjugated protein is referred to as the prosthetic group. This group can be a metal ion or a small organic molecule.

3. **Characteristics of Prosthetic Groups**: Prosthetic groups are tightly bound to the protein or enzyme and are not easily removed. They play a crucial role in the function of the protein.

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