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30 Cards in this Set

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An organism that grows best at about 15*C and does not grow above 20*C; a cold loving microbe
psychrophiles
An organism that grows between about 10*C and 50*C; a moderate-temperature-loving microbe
mesophiles
An organism whose optimum growth temperature is between 50*C and 60*C; a heat loving microbe
thermophiles
The lowest temperature at which a species will grow.
Minimum growth temperature
The temperature at which a species will grow
Optimum growth temperature
The highest temperature at which a species can grow.
Maximum growth temperature
An organism that is capable of growth between about 0*C and 30*C.
Psychrotrophs
An organism whose optimum growth temperature is at least 80*C; also called extreme thermophile
Hyperthermophiles
a type of hyperthermophile
Extreme thermophiles
A bacterium that grows below pH 4
Acidophiles
Loss of water from a cell in a hypertonic environment.
Plasmolysis
An organism that requires a high salt concentration for growth.
Extreme halophiles
An organism that requires high osmotic pressures such as high concentrations of NaCl.
Obligate halophiles
An organism capable of growth in, but not requiring, 1-2% salt
Facultative halophiles
the conversion of nitrogen (N2) into ammonia
nitrogen fixation
the living together of two different organisms or populations
symbiosis
a chemical element required in small amounts for growth
trace elements
an organism that requires molecular oxygen (O2)
obligate aerobes
an organism that can grow with or without molecular oxygen (O2)
facultative anaerobes
highly reactive molecular oxygen (O2-)
singlet oxygen
a toxic form of oxygen (02-) formed during aerobic respiration
superoxide free radicals
an enzyme that destroys superoxide free radicals
superoxidase dismutase
an oxygen anion consisting of two atoms of oxygen (O2 2-)
peroxide anion
an enzyme that catalyzes the breakdown of hydrogen peroxide to water and oxygen
catalase
an enzyme that breaks down hydrogen peroxide
peroxidase
O3
ozone
a toxic form of oxygen (OH.) formed in cytoplasm by ionizing radiation and aerobic respiration
hydroxyl radical
an organism that does not use molecular oxygen (O2) but is not afectedby its presence
aerotolerant anaerobes
an organism that grows best in an environment with less molecular oxygen (O2) than is normally found in air
microaerophiles
an essential organic compound that an organism is unable to synthesize
organic growth factor