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MCB-Growth

PBSC-MCB- Microbial Growth

QuestionAnswer
These microbes can grow in a high salt concentration in their environment, but it is not required. Facultative Halophiles
This enzyme works on hydrogen peroxide (the peroxide anion) to change it to water. Peroxidase
These anaerobes do not use oxygen, but can tolerate it and still be able to grow. Aerotolerant Anaerobes
These organisms require oxygen in small amounts for growth. Microaerophiles
Self feeders which get their energy from the sun and their carbon from carbon dioxide. Photosynthetic Autotrophs
These microbes prefer a high salt concentration in their environment. Extreme Halophiles
A relationship between two organisms where one benefits and the other is unaffected by the relationship. Commensalism
This is the enzyme that works on the superoxide radical to change it to hydrogen peroxide and oxygen. Superoxide Dismutase
Preferred temperature range of these microbes is 20-30 degrees C, which is perfect for your refrigerator. Psychrotrophs
These organisms cannot grow in the presence of oxygen. Obligate Anaerobes
When two organisms in live close relationship. Symbiosis
A device which measures direct microscopic count by using a specialized slide. (Measures both dead and live cells - disadvantage.) Petroff-Hausser cell counter
E.coli in the human intestine produce _______ which inhibit the growth of Salmonella and Shigella. Bacteriocins
The portion of the phase of growth in bacteria where there is no obvious change in number. Lag Phase
These organisms can use oxygen, but can switch to fermentation in the absence of oxygen. Facultative Anaerobes
Preferred temperature range of these microbes is 0-15 degrees C. Psychrophiles
The portion of the phase of growth in bacteria where cell death and new cell production are about equal. Stationary
The portion of the phase of growth in bacteria where there is a logarithmic increase in cell number. Exponential Growth (Log)
A relationship between two organisms where one benefits and the other is harmed by the relationship. Parasitism
The time required for the number of cells to double. Generation Time
These microbes must have a high salt concentration in their environment. Obligate Halophiles
A relationship between two organisms where both benefit from the relationship. Mutualism
Preferred temperature range of these microbes is your body temperature, 37 degrees C. Mesophiles
Preferred temperature range of these microbes is 50-60 degrees C. Thermophiles
The portion of the phase of growth in bacteria where the cell death exceeds new cell growth. Death Phase
Preferred temperature range of these microbes is 80-110 degrees C. Extreme Thermophiles
These microbes grow best at a pH less than 4. Acidophiles
Self feeders which get their energy from stripping electrons from inorganic compounds such as sulfates and nitrates. Chemosynthetic autotrophs
These organisms must have oxygen for growth. Obligate Aerobes
A type of cell measurement which involves serial dilutions and measures viable cells. Plate Counts
Organisms that get their energy from compounds assembled by other living things. Heterotrophs
A method to estimate the cell number by measuring optical density with a spectrophotometer. Turbidity
This enzyme works on hydrogen peroxide (the peroxide anion) to change it to water and oxygen. Catalase