19 Questions
During which phase do organisms increase in size and synthesize enzymes?
Lag phase
During which phase does population growth occur at an exponential rate?
Log phase
During which phase does cell division decrease to the point that new cells are produced at the same rate as old cells die?
Stationary phase
During which phase do cells lose their ability to divide and die?
Decline phase
What is the term for growth in colonies where cells divide at their most rapid rate?
Generation time
What is the term for growth in colonies where cells divide sometime during the generation time with a smooth line graph?
Nonsynchronous growth
What is the term for a chemically non-defined medium that contains reasonably familiar material but varies slightly in chemical composition from batch to batch?
Complex media
What is the term for a common ingredient in media that is a product of enzyme digestion of proteins?
Peptone
What is the term for materials found in nature that can be used as media?
Natural media
Which type of medium encourages the growth of some organisms but suppresses the growth of others?
Selective medium
What is the purpose of a selective medium?
To encourage growth of some organisms and suppress growth of others
Which medium is both selective and differential?
Differential medium
Which substance is fermented by organisms in the human intestines, but not by most pathogens?
Lactose
Which method is used when a diluted culture is added to a melted nutrient agar and poured into an empty dish?
Pour plate method
Which method is used when a diluted sample is placed on the center of a solid cooled agar medium and spread evenly?
Spread plate method
What does CFU stand for in microbiology?
Colony forming unit
What does MPN stand for in microbiology?
Most probably number
What is the purpose of the filtration method in microbiology?
To estimate the size of small bacterial populations
What does turbidity measure in microbiology?
Turbidity
Quiz: Understanding the Growth Phases of Organisms Test your knowledge of the growth phases of organisms with this quiz! Learn about the lag phase, where organisms increase in size and metabolic activity. Explore the log phase, where population growth occurs exponentially. Lastly, discover the phase where cell division slows down. Take the quiz and expand your understanding of organism growth!
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