Non-proteinaceous part of enzyme is

Options

A. Cofactor
B. Coenzyme
C. Prosthetic group
D. All the above.

Answer

To answer the question "Non-proteinaceous part of enzyme is," we need to understand the structure of enzymes and the components that make them functional. Here’s a step-by-step solution:

### Step 1: Define Enzymes
Enzymes are biological catalysts that speed up chemical reactions in living organisms. They are typically proteins, but they can also have non-protein components.

### Step 2: Understand the Structure of Enzymes
Enzymes are composed of two main parts:
- **Apoenzyme**: This is the protein part of the enzyme. It is responsible for the enzyme's specific activity.
- **Cofactor**: This is the non-protein part of the enzyme that is necessary for the enzyme's activity.

### Step 3: Classify Cofactors
Cofactors can be further classified into two categories:
- **Coenzymes**: These are organic molecules that are loosely bound to the apoenzyme. They assist in the enzyme's function but are not permanently attached.
- **Prosthetic Groups**: These are also non-protein components but are tightly bound to the apoenzyme. They are essential for the enzyme's activity.

### Step 4: Identify the Non-Proteinaceous Parts
From the definitions:
- **Cofactor**: Non-protein part of the enzyme.
- **Coenzyme**: A type of cofactor that is non-protein and loosely bound.
- **Prosthetic Group**: Another type of cofactor that is non-protein and tightly bound.

### Step 5: Conclusion
Since all three components (cofactor, coenzyme, and prosthetic group) are non-proteinaceous parts of the enzyme, the correct answer to the question is:
**All of the above.**

### Final Answer
The non-proteinaceous part of an enzyme is: **All of the above (cofactor, coenzyme, prosthetic group).**

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