Select incorrect statement w.r.t. eubacteria

Options

A. Have very simple structure
B. Peptidoglycan nature of cell wall
C. Heterotrophs are most abundant in nature
D. Show most simple metabolic diversity

Answer

### Step-by-Step Solution:

1. **Understanding Eubacteria**: Eubacteria, also known as true bacteria, belong to the kingdom Monera and are characterized as prokaryotic organisms. This means they do not have a defined nucleus or membrane-bound organelles.

2. **Evaluating the Statements**: The question asks to identify the incorrect statement regarding Eubacteria. We will analyze each statement provided in the options.

3. **Statement 1**: "Eubacteria have a very simple structure."
- **Analysis**: This statement is true. Eubacteria are known for their simple cellular structure.

4. **Statement 2**: "Eubacteria have a cell wall made of peptidoglycan."
- **Analysis**: This statement is also true. The cell wall of Eubacteria is primarily composed of peptidoglycan, which is a polymer of N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM).

5. **Statement 3**: "Heterotrophs are the most abundant in nature."
- **Analysis**: This statement is true. Many Eubacteria are heterotrophic, meaning they obtain their food from other organisms, either living or dead.

6. **Statement 4**: "Eubacteria show the most simple metabolic diversity."
- **Analysis**: This statement is incorrect. Eubacteria exhibit a wide range of metabolic diversity, including autotrophic, heterotrophic, and symbiotic modes of nutrition. The term "simple" is misleading because Eubacteria can have complex metabolic pathways.

7. **Conclusion**: The incorrect statement regarding Eubacteria is the fourth statement: "Eubacteria show the most simple metabolic diversity."

### Final Answer:
The incorrect statement with respect to Eubacteria is: **"Eubacteria show the most simple metabolic diversity."**

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