#1
Which part of the microscope controls the amount of light passing through the specimen?
Objective lens
Condenser
Eyepiece
Stage
#2
What is the function of the coarse adjustment knob on a microscope?
To focus on fine details
To adjust the amount of light
To move the stage up and down
To switch between objective lenses
#3
What is the function of a Petri dish in microbial culture?
To sterilize the culture medium
To hold the culture medium and allow microbial growth
To observe microbial motility
To measure bacterial density
#4
Which microbial culture technique involves the use of liquid media to grow bacteria?
Streak plate method
Agar slant method
Broth culture method
Pour plate method
#5
Which microbial culture technique involves the use of a loop to streak bacteria onto an agar plate?
Pour plate method
Spread plate method
Broth culture method
Streak plate method
#6
Which of the following is NOT a basic step in microbial culture techniques?
Inoculation
Incubation
Isolation
Sterilization
#7
What is the purpose of a streak plate technique in microbiology?
To count the number of bacterial colonies
To isolate pure bacterial colonies
To determine bacterial motility
To visualize bacterial morphology
#8
What does the acronym NA stand for in the context of microscope lenses?
Numerical Axis
Numerical Aperture
Narrow Angle
Nanometer Adjustment
#9
Which microbial culture technique involves the dilution of a sample to obtain discrete colonies on agar plates?
Streak plate method
Pour plate method
Spread plate method
Loop dilution method
#10
Which microscope technique is best suited for observing living cells in real-time?
Phase-contrast microscopy
Electron microscopy
Dark-field microscopy
Fluorescence microscopy
#11
Which microscope technique allows visualization of the internal structures of cells with high resolution?
Bright-field microscopy
Phase-contrast microscopy
Fluorescence microscopy
Electron microscopy
#12
What is the purpose of using a control group in microbial culture experiments?
To compare the experimental group with the untreated group
To ensure the accuracy of the results
To determine the effectiveness of the sterilization process
To provide a reference for the microbial species being cultured
#13
What is the purpose of using immersion oil in microscopy?
To reduce glare
To increase magnification
To improve resolution
To prevent lens damage
#14
What is the purpose of a hemocytometer in microbiology?
To measure bacterial growth rate
To count bacterial colonies
To determine bacterial motility
To quantify bacterial cell concentration
#15
Which microscope technique utilizes a laser to excite fluorescent dyes bound to specific cellular structures?
Confocal microscopy
Phase-contrast microscopy
Electron microscopy
Dark-field microscopy