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Bacteria and Viruses
key terms of bacteria and viruses
37
Biology
Undergraduate 1
05/20/2011

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Term
archaebacterium
Definition
kingdom of prokaryotes more like eukaryotic cells than eubacteria; includes methanogens, halophiles, and thermophiles.
Term
bacillus
Definition
a rod-shaped bacteria
Term
bacterial chromosome
Definition
each daughter cell of a bacteria inherits a circularized , double-stranded DNA molecule that has only a few proteins attached to it
Term
bacterial conjugation
Definition
the transfer of plasmid DNA from one bacterial cell to another
Term
bacterial flagellum
Definition
flagella used in mobility by rotating like a propeller.
Term
bacteriophage
Definition
category of viruses that infect bacterial cells
Term
coccus
Definition
spherical shaped bacteria
Term
disease
Definition
outcome of infection when defenses against a pathogen cannot be mobilized fast enough, and the pathogen's activities interfere with normal body functions
Term
emerging pathogen
Definition
deadly pathogen, either a newly mutated strain of an existing type or one that evolved a long time ago and is now exploiting an increased presence of human hosts
Term
endospore
Definition
resting structure formed by some bacteria; encloses a duplicate of the bacterial chromosome and a portion of cytoplasm
Term
epidemic
Definition
a disease that spreads rapidly through part of a population for a limited time, then the outbreak subsides.
Term
eubacterium
Definition
kingdom of all prokaryotic cells except archaebacteria
Term
extreme thermophile
Definition
"heat-lovers"; live in geothermally heated soils, sulfur-rich hot springs, and wastes from coal mines. catergory of archaebacteria that are the most heat-tolerant
Term
fruiting body
Definition
spore bearing structures. many myxobacteria colonies form fruiting bodies. some differentiate and form a slime stalk, others form branchings, and others form clusters of spores.
Term
glycocalyx
Definition
a sticky mesh, often encloses the cell well. consists of polysaccharides, polypeptides, or both
Term
gram stain
Definition
a stain that can help identify many bacterial species on the basis of their wall structure and composition. gram-positive cells will be purple, gram-negative cells will be pink
Term
halophile
Definition
"salt-lovers"; live in salty places. spoil salted produce
Term
heterocyst
Definition
cyanobacterial cell that modifies itself and makes a nitrogen-fixing enzyme when nitrogen supplise dwindle
Term
infection
Definition
invasion and multiplication of a pathogen in a host. disease follows if defenses are not mobilized fast enough; the pathogen's activities interfere with normal body functions
Term
lysis
Definition
gross damage to a plasma membrane, cell wall, or both that lets the cytoplasm to leak out; causes cell beath
Term
lysogenic pathway
Definition
latent period that extends many viral replication cycles. viral genes integrated into host chromosome and may stay inactivated through many host cell divisions but eventually are replicated in host progeny
Term
lytic pathway
Definition
of viruses, a rapid replication pathway that ends with lysis of host cell
Term
methanogen
Definition
anaerobic archaebacterium that produces methane gas as a by-product
Term
microorganism
Definition
organism, usually single celled. too small to be observed without a microscope
Term
numerical taxonomy
Definition
study of the degree of relatedness between individuals. usually dependant on traits
Term
pandemic
Definition
an epidemic that breaks out in several countries all around the world
Term
pandemic
Definition
an epidemic that breaks out in several countries all around the world
Term
pathogen
Definition
any virus, bacterium, or fungus that can infect an organism and cause disease
Term
pillus
Definition
short, filamentous protiens projected above cell wall that help move things
Term
plasmid
Definition
small, self-replicating circle of extra DNA
Term
prion
Definition
small infectious protein that causes disease of the nervous system
Term
prokaryotic cell
Definition
single celled organism, most often walled. lacks the profusion of membrane bound organelles
Term
prokaryotic fission
Definition
cell division mechanism by which bacterial cells reproduce
Term
spirillum
Definition
a cell body with one or more twists
Term
strain
Definition
two types of something that show minor differences
Term
viroid
Definition
tightly folded strands or circles of RNA
Term
virus
Definition
a noncellular infectious agent that has two characteristics
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