Microbiology LAB Exam 1 Questions and Answers Graded A+
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Course
Microbiology LAB
Institution
Microbiology LAB
Microbiology LAB Exam 1 Questions
and Answers Graded A+
What is the primary function of the cell wall in bacteria?
To provide structural support and protection.
What is the purpose of a Gram stain?
To differentiate bacterial species into Gram-positive and Gram-negative based on their cel...
Microbiology LAB Exam 1 Questions
and Answers Graded A+
What is the primary function of the cell wall in bacteria?
✔✔To provide structural support and protection.
What is the purpose of a Gram stain?
✔✔To differentiate bacterial species into Gram-positive and Gram-negative based on their cell
wall composition.
Which type of microscope is commonly used to view bacteria?
✔✔A compound light microscope.
What is the role of a differential media in microbiology?
✔✔To distinguish between different types of microorganisms based on specific biochemical
characteristics.
How does a colony appear when it is formed on an agar plate?
✔✔A visible cluster of microbial cells that arise from a single progenitor cell.
1
,What is the typical pH range for bacterial growth in a laboratory environment?
✔✔Most bacteria prefer a neutral pH between 6.5 and 7.5.
What is the purpose of an inoculating loop in microbiological procedures?
✔✔To transfer microbial cultures onto media for growth.
What is the main difference between prokaryotic and eukaryotic cells?
✔✔Prokaryotic cells lack a membrane-bound nucleus and organelles, unlike eukaryotic cells.
Which of the following bacteria are capable of endospore formation?
✔✔Bacillus and Clostridium species.
How does selective media function in microbiological tests?
✔✔It allows the growth of specific types of microorganisms while inhibiting others.
What is the significance of an autoclave in microbiology?
✔✔To sterilize equipment and media by using high-pressure steam.
2
, What does the presence of catalase enzyme indicate in a bacterial culture?
✔✔The ability to break down hydrogen peroxide into water and oxygen, helping the bacteria
survive oxidative stress.
What is the purpose of an antibiotic susceptibility test in microbiology?
✔✔To determine the effectiveness of antibiotics against specific bacterial pathogens.
How are bacterial cells classified based on their shape?
✔✔Bacteria are classified into cocci, bacilli, and spirilla based on their shape.
What is the function of agar in microbiological media?
✔✔To provide a solid surface for bacterial growth.
Which test is used to identify the presence of Gram-negative bacteria?
✔✔The Gram stain.
What is the purpose of a streak plate method?
3
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