1. Bacteria
Lab 16

2. Bacteria Prokaryotes lack organelles.
Bacteria are the simplest forms of life.
Bacteria contain DNA, but it is not contained in a nucleus.
Bacteria reproduce by fission – they simply split in two.

3. Bacteria
Most bacteria are saprotrophic – they send out digestive enzymes into the environment and then take up the nutrient molecules.
Some bacteria are parasitic and cause disease.

4. Bacteria
Others are photosynthetic or chemosynthetic making organic (food) molecules from inorganic molecules.
A colony contains cells that are all descended from one original cell.

5. Shapes of Bacteria Bacteria come in 3 shapes: Bacillus (rod)
Coccus (round)
Spirillum (spiral)
Images by Biodisc company.

6. Bacterial Structure
Basic structure includes a loop of DNA, ribosomes, a plasma membrane, a cell wall, sometimes a capsule.
Some bacteria move about using a flagellum.
Pili are used for attachment.