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Microbiology - Chapter One
The Microbial World and You
23
Biology
Undergraduate 1
05/22/2006

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Term
pathogen
Definition
a disease-causing organism.
Term
pathogenicity
Definition
the ability of a microorganism to cause disease by overcoming the defenses of a host.
Term
genus
Definition
the first name of the scientific name (binomial); the taxon between family and species.

plural: genera
Term
specific epithet
Definition
the second or species name in a scientific binomial.
Term
species
Definition
the most specific level in the taxonomic hierarchy.
Term
bacteria
Definition
kingdom of prokaryotic organisms, characterized by peptidoclycan cell walls

singular: baterium
Term
prokaryote
Definition
a cell whose genetic material is not enclosed in a nuclear envelope.
Term
archaea
Definition
prokaryotic cells lacking peptidoglycan; one of the three domains.
Term
fungus
Definition
an organism that belongs to the Kingdom Fungi; a eukaryotic absorptive chemoheterotroph.

plural: fungi
Term
eukaryote
Definition
a cell having DNA inside a distinct membrane-enclosed nucleus.
Term
protozoan
Definition
unicellular eukaryotic organisms; usually chemoheterotrophic.

plural: protozoa
Term
alga
Definition
a photosynthetic eukaryote; may be unicellular, filamentous, or mutlicellular but lack the tissues found in plants.

plural: algae
Term
virus
Definition
a submicroscopic, parasitic, filterable agent consisting of a nucleic acid surrounded by a protein coat.
Term
helminth
Definition
a parasitic roundworm or flatworm.
Term
cell theory
Definition
all living organisms are composed of cells and arise from preexisting cells.
Term
spontaneous generation
Definition
the idea that life could arise spontaneously from nonliving matter.
Term
biogenesis
Definition
the theory that living cells arise only from preexisting cells.
Term
aseptic techniques
Definition
laboratory techniques used to minimize contamination.
Term
germ theory of disease
Definition
the principle that microorganisms cause disease.
Term
Koch's postulates
Definition
criteria used to determine the causative agent of infectious diseases.
Term
fermentation
Definition
the enzymatic degradation of carbohydrates in shich the final electron acceptor is an organic molecule, ATP is sythesized by substrate-level phosphorylations and O2 is not required.
Term
pasteurization
Definition
the process of mild heating to kill particular spoilage microorganisms or pathogens.
Term
immunity
Definition
the body's defense against particular pathogenic microorganisms; also called specific resistance.
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