Microbiology Lab Exam 1 Questions and
Answers 100% Correct
What type of media is used to grow microorganisms from a sample collected from a patient?
✔✔Selective and differential media.
What is the purpose of the streak plate method?
✔✔To isolate a specific microorganism from a mixture.
What is the main difference between prokaryotic and eukaryotic cells?
✔✔Prokaryotic cells do not have a nucleus, while eukaryotic cells do.
Which microscope is most commonly used in microbiology laboratories for viewing bacterial
specimens?
✔✔The light microscope.
What type of bacteria are known to stain purple after a Gram stain?
✔✔Gram-positive bacteria.
1
,What is an example of a selective medium?
✔✔MacConkey agar.
How do you differentiate between anaerobic and aerobic bacteria?
✔✔By their oxygen requirements for growth.
What is the term for the arrangement of bacterial cells in pairs?
✔✔Diplococci.
Which microorganism is responsible for causing tuberculosis?
✔✔Mycobacterium tuberculosis.
What is a pure culture in microbiology?
✔✔A culture containing only one type of microorganism.
What is the function of agar in microbiological media?
✔✔To provide a solid surface for microbial growth.
2
, Which type of bacteria are typically acid-fast?
✔✔Mycobacteria.
What is the role of a bacterial capsule in pathogenicity?
✔✔To protect the bacterium from phagocytosis.
What is a common method used to measure bacterial growth?
✔✔Measuring turbidity or optical density.
What is the purpose of a biochemical test in microbiology?
✔✔To identify bacteria based on their metabolic characteristics.
Which bacteria are known to be spore-forming?
✔✔Bacillus and Clostridium.
What is the difference between a facultative anaerobe and an obligate anaerobe?
✔✔A facultative anaerobe can grow with or without oxygen, while an obligate anaerobe cannot
tolerate oxygen.
3
Answers 100% Correct
What type of media is used to grow microorganisms from a sample collected from a patient?
✔✔Selective and differential media.
What is the purpose of the streak plate method?
✔✔To isolate a specific microorganism from a mixture.
What is the main difference between prokaryotic and eukaryotic cells?
✔✔Prokaryotic cells do not have a nucleus, while eukaryotic cells do.
Which microscope is most commonly used in microbiology laboratories for viewing bacterial
specimens?
✔✔The light microscope.
What type of bacteria are known to stain purple after a Gram stain?
✔✔Gram-positive bacteria.
1
,What is an example of a selective medium?
✔✔MacConkey agar.
How do you differentiate between anaerobic and aerobic bacteria?
✔✔By their oxygen requirements for growth.
What is the term for the arrangement of bacterial cells in pairs?
✔✔Diplococci.
Which microorganism is responsible for causing tuberculosis?
✔✔Mycobacterium tuberculosis.
What is a pure culture in microbiology?
✔✔A culture containing only one type of microorganism.
What is the function of agar in microbiological media?
✔✔To provide a solid surface for microbial growth.
2
, Which type of bacteria are typically acid-fast?
✔✔Mycobacteria.
What is the role of a bacterial capsule in pathogenicity?
✔✔To protect the bacterium from phagocytosis.
What is a common method used to measure bacterial growth?
✔✔Measuring turbidity or optical density.
What is the purpose of a biochemical test in microbiology?
✔✔To identify bacteria based on their metabolic characteristics.
Which bacteria are known to be spore-forming?
✔✔Bacillus and Clostridium.
What is the difference between a facultative anaerobe and an obligate anaerobe?
✔✔A facultative anaerobe can grow with or without oxygen, while an obligate anaerobe cannot
tolerate oxygen.
3
