18 Questions
What term refers to the time required for a cell to divide and its population to double?
Generation time
During which growth phase do bacteria multiply at the fastest rate possible under the provided conditions?
Log phase
What type of representation is used for bacterial populations where division occurs in a logarithmic progression?
Exponential progression
In which phase of growth does equilibrium exist between cell division and cell death?
Stationary phase
What method involves direct measurement of microbial growth through the use of Heterotrophic plate count and Direct microscopic count?
Filtration method
Which bacterial growth curve phase experiences a situation where the number of deaths exceed the number of new cells formed?
Death phase
What is the significance of understanding the conditions necessary for microbial growth?
To control the growth of helpful microbes
What are the physical requirements for microbial growth?
Temperature, pH, Osmotic pressure
Which term describes bacteria that thrive in cold environments?
Psychrophiles
What is the most common method of food preservation mentioned in the text?
Low temperatures
At what temperature do most bacteria grow within a limited range?
At moderate temperatures
What do psychrophiles prefer in terms of temperature?
Cold loving
What is the range of pH where most bacteria grow best?
pH 6.5 to 7.5
Which microorganisms have an optimum pH range of 5 to 6 for growth?
Molds & yeasts
What are chemical buffers used for in bacterial cultures?
To neutralize acids and maintain proper pH
In a hypertonic solution, what happens to cellular water in microbial cells?
It leaks out through the plasma membrane
What is the primary physical growth requirement for microorganisms?
Nutrients in solution
Which microorganisms tolerate acidity and thrive in lower pH levels?
Acidophiles
Test your knowledge on bacterial generation time and population growth. Learn about how generation time varies among organisms and its representation in logarithmic progression.
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