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