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 - PowerPoint PPT PresentationTRANSCRIPT
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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