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16 Cards in this Set
- Front
- Back
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What are the 3 domains of life?
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The 3 domains of life are eukarya, archaea, and bacteria.
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What are prokaryotes?
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Prokaryotes are complex cells that lack the membrane-enclosed organelles of eukaryotic cells. However, they have micro-compartments.
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How do prokaryotic cells differ from eukaryotic cells?
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Prokaryotic cells are usually smaller and they lack membrane-enclosed organelles.
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What shapes can prokaryotes be found in?
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bacillus, coccus, and spiral (corkscrew)
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What is the role of the cell wall?
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The cell wall contributes to cell shape and reduces membrane abrasian and osmotic rupture.
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What are biofilms?
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Biofilms are complex microbial communities embedded in biological polymers that attach to surfaces.
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What is the sticky coat of the prokaryote?
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capsule
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What is the attachment pili of the prokaryote?
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fimbriae
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What allows the prokaryote to exchange DNA?
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sex pilus
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What is flagellum?
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Flagellum is a propulsion and sensory device.
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What does binary fission produce?
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Binary fission produces two identical daughter cells.
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How can bacteria exchange DNA among themselves?
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conjugation - DNA exchange via the sex pilus
transduction - phage transfer bacterial DNA transformation - direct DNA uptake |
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Why do some species form endospores?
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Some species form endospores in response to stress.
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How do prokaryotic cells perform movement (motility or taxis)?
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flagellum, gas filled vesicles, type IV pilus
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What are the ecological roles of prokaryotes?
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decomposers (most important function)
primary producers nitrogen fixers mutualists pathogens predators |
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How does the sex pilus allow DNA exchange?
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A hollow tube permits DNA exchange.
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