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Cells are the basic unit of life. Cells are classified as prokaryotes or
eukaryotes
Cells
Prokaryote Eukaryote
Oldest cells – probably the first life on earth Very simple cells composed of 2 main parts
◦ Cell Membrane – the outer boundary of the cell◦ Cytoplasm – jelly-like interior of the cell
The name prokaryote comes from the Greek pros meaning “before” and karyon meaning “nut”, referring to the nucleus
Most prokaryotes are single celled organisms
Example: bacteria
More advanced cells Found in plants and animals Eukaryotic cells are composed of 4 main
parts: ◦ Cell Membrane – the outer boundary of the cell◦ Cytoplasm – jelly-like interior of the cell◦ Nucleus – the control center of the cell which
contains the cell’s genetic material (DNA)◦ Organelles – structures that carry out cell
functions Organisms can be single-celled or
multicellular
Plant cell
Examples:Single Celled – algaeMulticellular - onion
Animal cell
Examples:Single Celled: Amoeba, ProtozoanMulticellular: Human