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