The Two Cell Types

There are two basic cell types:  Prokaryotic cells are simple cells Prokaryotic cells  Eukaryotic cells are more complex Eukaryotic cells  Prokaryotic cells are simple cells Prokaryotic cells  Eukaryotic cells are more complex Eukaryotic cells

Prokaryotes  No nucleus  No internal compartments (these are also known as organelles)  Cells are very small- about.1 – 1 µm Example: Vibrio (a type of bacteria)  No nucleus  No internal compartments (these are also known as organelles)  Cells are very small- about.1 – 1 µm Example: Vibrio (a type of bacteria)

A typical prokaryotic cell

Eukaryotes  DO have a nucleus  DO have internal compartments (organelles)  Usually very complex in structure  Cells are larger- >1 µm  Example: a cheek cell or paramecium  DO have a nucleus  DO have internal compartments (organelles)  Usually very complex in structure  Cells are larger- >1 µm  Example: a cheek cell or paramecium

A typical eukaryotic cell

Relative Cell Sizes

Can you tell which is which?

Can you tell which are which?