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20 Cards in this Set
- Front
- Back
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What is a symbiotic relationship?
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An association where two species are mutually dependent
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What is commensalism?
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Where only one species benefits and the other is unharmed
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What is a parasitic relationship?
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One derives its nutrients from and at the expense of the other
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What is an obligative parasite?
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one that requires the host to live
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What is a facultative parasite?
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one that doesn't require the host to survive
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What are strict or primary pathogens?
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are infective to healthy hosts
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What are opportunistic pathogens?
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cause infection when the host is already compromised
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What are the steps a pathogen must successfully perform?
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entering host, adhering to tissue, entering a cell, growing to significant titre, causing tissue destruction
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What are some of the innate barriers humans have against disease?
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lysozyme, cilia, chemical state, flushing, normal flora
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What is a niche?
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a certain area bacteria have adapted to living in
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What is the bacteria capsule composed of?
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polysaccharides, and sometimes aa
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What are three functions of the bacterial capsule?
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protects from host defense, aids in attachment, can be harmful to host
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What is the function of the flagella?
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motility which is important in pathogenesis
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What is significant about the flagella?
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highly antigenic, so there are usually antibodies against them that can be used diagnostically
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What is the function of the pili?
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attachment
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What is special about the mycoplamsa?
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it has only an inner cell layer of special composition and it can be a variety of shapes
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What is the organelle of virulence?
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type III secretory system
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What does a type III secretory system resemble?
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flagella
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What is a sidophore?
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Fe scavenging molecule used to import Fe
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What are three adaptative process a cell can undergo?
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spore formation, SOS system, and Heat shock response
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