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17 Cards in this Set

  • Front
  • Back
What is a pure culture?
a population of cells that are genetically identical and have asexual-binary fission
How many bacteria are in a pure culture?
one
Why are pure cultures necessary?
needed to study bacterial characteristics
Characteristics of cell colonies
a clump of genetically identical cells, are derived from one original cell, and are made up of pure cultures
Pour Plate Method
Creates individual surface and sub-surgace colonies
Effects of Temperature on Growth
Bacterial growth is directly effected by external temperature
What is the range of bacterial growth?
Each species of bacteria has a range of 20-30 degrees at which it can grow
definition of minimum growth temperature
lowest temp at which a bacteria species will grow
maximum growth temperature
highest temp at which a bacteria species will grow
optimum growth temperature
temerature at which a bacteria species grows best
Psychrophiles
grow at colder temperatures; 0-20 degrees celcius (32-68 F)
mesophiles
mid-range temperature growth; 20-45 C (68-104 F)
Thermophiles
grow at hotter temperatures; above 45C (104F)
What catergories of Bacteria can survive without oxygen
obligate anaerobes (will die in its presence); faculatative bacteria (can grow with or without);
What categories of bacteria need oxygen to survive?
obligate aerobes (need oxygen to survive); microaerophilics (need oxygen but only small amount)
What is an anaerobe jar?
Used to create a controlled oxygen free environment for obligate anaerobes to grow.
How do you know that there no oxygen exists in the anaerobe jar?
indicator strip that contains methylene blue that will appear blue when there is oxygen and white when there is no oxygen present