Select the wrong statement of a bacterial cell

Options

A. Mesosome is formed by outfoldings of plasma membrane
B. Pili are elongated tubular structures made up of a protein
C. Flagellum is composed of filament, hook and basal body
D. Fimbriae are small bristle like fibres spruting out of cell.

Answer

To determine the wrong statement regarding bacterial cells, let's analyze each statement provided:

1. **Mesosome is formed by outfoldings of the plasma membrane.**
- **Analysis**: Mesosomes are actually infoldings of the plasma membrane, not outfoldings. They serve to increase the surface area for enzymatic activity and help in DNA distribution during cell division. Therefore, this statement is incorrect.

2. **Pili are elongated tubular structures made up of proteins.**
- **Analysis**: This statement is correct. Pili (or pilus) are indeed tubular structures composed of a protein called pilin. They play a role in bacterial conjugation, which is a form of sexual reproduction in bacteria.

3. **Flagellum is an elongated structure formed as an outfolding of the plasma membrane and has three parts: filament, hook, and basal body.**
- **Analysis**: This statement is also correct. The flagellum is indeed an elongated structure that aids in motility and consists of the filament, hook, and basal body.

4. **Fimbriae are small bristle-like fibers that sprout out of the cell and their main function is attachment.**
- **Analysis**: This statement is correct as well. Fimbriae are hair-like structures that help bacteria adhere to surfaces or host tissues.

Based on the analysis, the wrong statement about bacterial cells is:

**Answer**: Mesosome is formed by outfoldings of the plasma membrane.