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3.1 Review Cell theory, prokaryotes, eukaryotes, scientists Cell theory • All cells come from other cells • Cells are the most basic unit of life • All living organisms are composed of cells Robert Hooke Antonie Van Leeuwenhoek Matthias Jakob Schleiden Theodore Schwann Rudolf Virchow Prokaryotic Cells No nucleus Bacteria No membrane bound organelles All unicellular Smallest cell type Eukaryotic cells Nucleus Membrane bound organelles Animal Plant Fungi Protist Larger, complex cells Unicellular or multicellular Both Prokaryotes and Eukaryotes Cell membrane Ribosomes Genetic material