18 Questions
What does the y-axis represent in a graph plotting the logarithmic number of viable organisms against incubation time?
Logarithmic number of viable organisms
Which organisms can survive and multiply only within living host cells?
Viruses
Which laboratory method is used to culture some obligate intracellular pathogens like rickettsias and chlamydias?
Growing in cell cultures
Which solid culture medium is selective for fungi due to its low pH?
Sabouraud dextrose agar (SDA)
Why is caution necessary when culturing fungi in the laboratory?
Some are highly infectious
Which method is most commonly used to culture protozoa in microbiology laboratories?
Culturing in cell cultures
What is the purpose of using a spectrophotometer in microbiology?
To measure turbidity of the medium as an indicator of growth
How does viable plate count determine the number of viable bacteria in a liquid sample?
By making serial dilutions and inoculating onto nutrient agar
In microbiology, what is the purpose of a CO2 incubator?
To maintain the appropriate atmosphere for bacterial growth
What technique is used to determine bacterial contamination of drinking water?
Viable plate count
How is a population growth curve typically determined in microbiology?
By collecting samples at intervals to determine viable organisms
Which method is used to determine either the total number of bacterial cells or the number of viable cells in a liquid sample?
Viable plate count
Which type of medium contains special nutrients that promote the growth of fastidious organisms?
Enriched medium
Which medium inhibits the growth of gram-positive bacteria and promotes the growth of gram-negative bacteria?
MacConkey agar
What type of agar inhibits the growth of gram-negative bacteria and promotes the growth of gram-positive bacteria?
Phenylethyl alcohol agar
Which medium permits differentiation of organisms that grow on it?
Differential medium
What is added to selective media to discourage the growth of certain organisms while allowing the growth of desired organisms?
Inhibitors
Why is aseptic technique practiced in microbiology labs?
To exclude microbes from specific areas
Test your knowledge on incubation processes in microbiology and how microbiologists determine bacterial population counts in different environments. Learn about CO2 incubators, non-CO2 incubators, and methods for counting bacterial cells.
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