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Microbiology Lab Quiz 1 Latest Update Graded A+
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Microbiology Lab Quiz 1 Latest Update Graded A+ What is the primary purpose of a streak plate technique in microbiology? To isolate a pure culture from a mixed sample. What is the main function of the agar in microbiological media? To provide a solid surface for the growth of microorgani...

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  • December 9, 2024
  • 16
  • 2024/2025
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Microbiology Lab Quiz 1 Latest Update
Graded A+
What is the primary purpose of a streak plate technique in microbiology?


✔✔To isolate a pure culture from a mixed sample.




What is the main function of the agar in microbiological media?


✔✔To provide a solid surface for the growth of microorganisms.




What type of microscope is most commonly used in microbiology labs for examining bacteria?


✔✔The light microscope.




What is the key characteristic of Gram-positive bacteria?


✔✔They have a thick peptidoglycan layer in their cell wall.




What is the primary purpose of performing a Gram stain?


✔✔To differentiate bacteria based on the structure of their cell walls.




1

,What is the definition of a bacterial colony?


✔✔A group of bacteria originating from a single cell.




What is the purpose of using a flame when sterilizing equipment in the microbiology lab?


✔✔To kill any microbial contaminants and prevent cross-contamination.




What does a positive catalase test indicate?


✔✔The presence of the enzyme catalase in the bacterial sample.




What is the role of the peptidoglycan layer in bacterial cells?


✔✔To provide structural integrity and support to the cell wall.




What does an oxidase test determine in bacteria?


✔✔The presence of cytochrome c oxidase enzyme.




What is the purpose of using selective media in microbiological studies?


✔✔To promote the growth of specific types of bacteria while inhibiting others.




2

, What does a positive result for the urease test indicate?


✔✔The bacterium produces the enzyme urease, which breaks down urea into ammonia.




What is the function of the ribosomes in bacterial cells?


✔✔To synthesize proteins by translating mRNA into amino acid sequences.




What type of bacteria are acid-fast?


✔✔Mycobacteria.




What is the most common method to sterilize microbiological equipment?


✔✔Autoclaving (using high-pressure steam).




What is the role of the flagella in bacteria?


✔✔To provide motility, allowing the bacterium to move toward or away from stimuli.




What is the function of the bacterial capsule?


✔✔To protect the bacterium from phagocytosis and help it adhere to surfaces.




3

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