Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key


Play button


Play button




Click to flip

30 Cards in this Set

  • Front
  • Back
An organism that grows best at about 15*C and does not grow above 20*C; a cold loving microbe
An organism that grows between about 10*C and 50*C; a moderate-temperature-loving microbe
An organism whose optimum growth temperature is between 50*C and 60*C; a heat loving microbe
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.
An organism whose optimum growth temperature is at least 80*C; also called extreme thermophile
a type of hyperthermophile
Extreme thermophiles
A bacterium that grows below pH 4
Loss of water from a cell in a hypertonic environment.
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
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
an enzyme that breaks down hydrogen peroxide
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
an essential organic compound that an organism is unable to synthesize
organic growth factor