Select incorrect statement regarding prokaryotes.

Options

A. Prokaryotes have something unique in the form of inclusions.
B. Mesosome is a specialised undifferentiated form of cell membrane
C. Bacteria have small circular DNA
D. Pili help in attachment and DNA transfer

Answer

To solve the question regarding the incorrect statement about prokaryotes, we will analyze each option provided:

1. **Prokaryotes have something unique in the form of inclusions.**
- This statement is **correct**. Prokaryotes, such as bacteria, have inclusion bodies that serve as storage for nutrients and other substances.

2. **The mesosome is a specialized undifferentiated form of salmonellae.**
- This statement is **incorrect**. Mesosomes are not a specialized form of salmonellae; rather, they are infoldings of the plasma membrane in prokaryotic cells that are involved in various cellular processes, including respiration.

3. **Bacteria have small circular DNA.**
- This statement is **correct**. Bacteria typically possess a single, circular strand of DNA that serves as their genetic material.

4. **Pili help in attachment and DNA transfer.**
- This statement is **correct**. Pili are hair-like structures on the surface of bacteria that facilitate attachment to surfaces and play a role in the transfer of DNA during conjugation.

**Conclusion:**
The incorrect statement regarding prokaryotes is the second option: "The mesosome is a specialized undifferentiated form of salmonellae."