The bacteria are organisms prokaryotes. The main difference with eukaryotic cells is that they do not have a true nucleus. They are unicellular organisms that have different shapes, but with a common basic structure:
- Their DNA is free and scattered throughout the cytoplasm.
- They do not have membranous organelles like mitochondria, chloroplasts, Golgi apparatus, endoplasmic reticulum, etc.
- They also do not have a cytoskeleton or intracellular mobility.