Prokaryotes are the oldest living organisms on Earth, dating back to 3.5 billion years ago. They function as single cells; in other words, they are unicellular. Each cell is only about 1 micrometer (μm) in size!
Prokaryotes are part of the kingdoms Archaea & Eubacteria.
Prokaryotes have this basic structure:
Prokaryotes have:
a plasma membrane (or cell membrane), which [...]
