Diagram of a Paramecium protozoan

- The image depicts a prokaryotic cell, specifically a bacterium.
- It has a rod-shaped (bacillus) morphology.
- The cell is surrounded by a cell wall and an outer membrane, typical of Gram-negative bacteria.
- Numerous flagella are attached to one end, indicating it is monotrichous and capable of motility.
- Pili (fimbriae) are present on the surface, which are involved in attachment and conjugation.
- The nucleoid region is visible as an irregularly shaped area, containing the bacterial chromosome without a nuclear envelope.
- Ribosomes are represented as small dots scattered throughout the cytoplasm.
- A plasmid, a small circular DNA molecule, is shown within the cytoplasm.
- The absence of membrane-bound organelles confirms it is a prokaryote.