Bacteria:
• Microscopic single-celled organisms;
• They have:
- a cell wall
- cell membrane
- cytoplasm
- plasmids
• They lack a nucleus but contain a circular chromosome of DNA.
• Some bacteria can carry out photosynthesis but most feed off other living or dead organisms.
• e.g.
- Lactobacillus Bulgaricus - a rod-shaped bacterium used in the production of yoghurt from milk.
- Pneumococcus - a spherical bacterium that acts as the pathogen causing pneumonia.
