Components of an enzymes are mostly

Options

A. Polypeptide chains
B. Polypeptide chains and non proteinaceous substances
C. Polynucleotides and non proteinaceous sub stances
D. 1 or 2

Answer

### Step-by-Step Solution:

1. **Understanding Enzymes**: Enzymes are biological catalysts that speed up metabolic reactions. They are primarily composed of proteins, which are made up of polypeptide chains.

2. **Defining Complete Enzymes**: The complete form of an enzyme is called a holoenzyme. A holoenzyme consists of two main components:
- **Apoenzyme**: This is the protein part of the enzyme, which is a polypeptide chain.
- **Cofactor**: This is the non-protein part, which can be an inorganic molecule or a metal ion.

3. **Analyzing the Options**:
- **Option A**: "Polypeptide chain" - This is correct as enzymes are primarily made of polypeptide chains (the protein part).
- **Option B**: "Polypeptide chains and non-protein-ish substances" - This is also correct since enzymes can consist of both the protein part (apoenzyme) and the non-protein part (cofactor).
- **Option C**: "Polynucleotide and non-protein-ish substances" - This is incorrect because polynucleotides refer to nucleic acids (like DNA and RNA), which are not components of enzymes.
- **Option D**: "One or two" - This option suggests that the components of enzymes can be either just the polypeptide chain or both the polypeptide chain and non-protein substances, which is correct.

4. **Conclusion**: The correct answer to the question "Components of an enzymes are mostly" is **Option D**: "One or two".