Which of the following is incorrect for bacteria ?

Options

A. Slime layer contains peptidoglycan
B. Central mesosomes help in holding the nucleoid
C. Teichoic acids are acidic polymers consisting of ribitol and glycerols
D. Chlorobium is photolithotrophic and green sulphur bacteria

Answer

To determine which statement about bacteria is incorrect, we will analyze each statement provided in the question.

### Step-by-Step Solution:

1. **Analyze the First Statement: "Slime layer contained Peptidoglycan."**
- The slime layer is an unorganized layer of extracellular material found outside the cell wall of bacteria.
- It primarily consists of exopolysaccharides, glycoproteins, and glycolipids, but **does not contain peptidoglycan**.
- **Conclusion:** This statement is incorrect.

2. **Analyze the Second Statement: "Central mesosomes help in holding the nucleoid."**
- Mesosomes are infoldings of the plasma membrane in bacteria.
- They play a role in various cellular processes, including the organization of the nucleoid (the region containing the bacterial chromosome).
- **Conclusion:** This statement is correct.

3. **Analyze the Third Statement: "Teichoic acids are the acid polymer consisting of ribotol and glycerol."**
- Teichoic acids are indeed polymers that can be composed of ribitol or glycerol phosphate.
- They are found in the cell walls of Gram-positive bacteria and play a role in cell wall maintenance and regulation.
- **Conclusion:** This statement is correct.

4. **Analyze the Fourth Statement: "Chlorobium is the photolithotropic and the green sulfur bacteria."**
- Chlorobium is a genus of green sulfur bacteria that are photolithotrophic, meaning they obtain energy through photosynthesis using light and inorganic substances.
- **Conclusion:** This statement is correct.

### Final Conclusion:
The incorrect statement regarding bacteria is the **first statement**: "Slime layer contained Peptidoglycan."

---