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Download Prokaryotes, Eukaryotes and Viruses
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Prokaryotes, Eukaryotes and Viruses Are they all living? Living Cells • All living organisms are made up of two basic types of cells –Prokaryotic cells are bacterial cells –Eukaryotic cells are plant and animal cells The Cell Theory • All living organisms are made of cells • All cells come from preexisting cells • Cells are the basic unit of life Prokaryotes Bacterial cells A bacterium: •contains 0.001 times less DNA than Eukaryotes •is surrounded by a membrane and cell wall •lacks membranebound organelles • Cyanobacteria - “blue-green algae” are bacteria that contain chloroplasts for photosynthesis Eukaryotes Plant and animal cells • • • • Plasma membrane Cell wall in plant cells only Cytoplasm (semifluid) Cytoskeleton (suspend organelles and give shape) cyto=cell • Contains membrane bound organelles Viruses • Are they a type of cell? • No! Viruses are just genetic information surrounded by a protein coat Bacteriophage – a virus that infects bacteria • Viruses can’t reproduce on their own • They need a host cell to “infect” VIRUS ANIMAL CELL PLANT CELL BACTERIAL CELL
