20 Questions
Which type of medium encourages the growth of some organisms but suppresses the growth of others?
Blood agar
During which phase of population growth do organisms increase in size and synthesize enzymes?
Lag phase
What type of medium has a constituent that causes an observable change in the medium when a particular biochemical reaction occurs?
Selective medium
During which phase of population growth does population growth occur at an exponential rate?
Log phase
Which two characteristics describe SPS and MacConkey agar?
Selective and differential
During which phase of population growth does cell division decrease to the point that new cells are produced at the same rate as old cells die?
Stationary phase
Which substance is fermented by organisms in the human intestines, whereas most pathogens do not?
Lactose
Which method involves adding a diluted culture to a melted nutrient agar and pouring it into an empty dish?
Pour plate method
During which phase of population growth do cells lose their ability to divide and thus cells die?
Decline phase
What is the term for organisms dividing at their most rapid rate?
Generation time
Which method involves placing a diluted sample on the center of a solid cooled agar medium and spreading it evenly?
Spread plate method
What does CFU stand for in microbiology?
Colony forming unit
What is the term for growth in colonies that is not synchronized?
Nonsynchronous growth
What is the term for the descendants of the original cell?
Colony
Which method is used when samples contain too few organisms to give reliable measures of population size by the standard plate count method?
Most probably number (MPN)
What method uses agar plates and involves depositing streaks of bacteria using a sterile wire loop?
Streak plate method
Which method is used to estimate the size of small bacterial populations by drawing water or air through a filter with pores too small to allow passage of bacteria?
Filtration
What is measured to estimate bacterial growth indirectly?
Metabolic products
What are materials found in nature called?
Natural media
What are materials from the laboratory called?
Synthetic media
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!
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
