Microbiology Module 3 Portage
Learning Exam Questions and
Answers 100% PASS
A micrometer is defined as:—ANSWER-10-6
Resolution and contrast are two critical factors that influence your ability to see an object.
Explain each.—ANSWER-Resolution is the distance between two objects that can be seen as
separate. Poor or low resolution means two (or more) objects may appear as one.
Contrast is the difference in light absorbance between two objects. Poor contrast gives a
high background and makes visualization of multiple objects difficult.
Assuming a constant (non-adjustable) light source power, identify the part of the microscope
you would adjust to limit the amount of light entering the microscpe.—ANSWER-Iris
diaphragm
What is the total magnification (relative to your eye) of a sample imaged with a 20x
objective and a 15x eyepiece? Show your math.—ANSWER-20 x 15 = 300x magnification
True or false: Staining is often required to image a cell that is adherent and flat.—ANSWER-
True
Which of the following could be seen clearly by the unaided eye? Select all that apply.—
ANSWER-Skin cell with diameter of 1500mm; Protozoa with a diameter of 250 mm
Learning Exam Questions and
Answers 100% PASS
A micrometer is defined as:—ANSWER-10-6
Resolution and contrast are two critical factors that influence your ability to see an object.
Explain each.—ANSWER-Resolution is the distance between two objects that can be seen as
separate. Poor or low resolution means two (or more) objects may appear as one.
Contrast is the difference in light absorbance between two objects. Poor contrast gives a
high background and makes visualization of multiple objects difficult.
Assuming a constant (non-adjustable) light source power, identify the part of the microscope
you would adjust to limit the amount of light entering the microscpe.—ANSWER-Iris
diaphragm
What is the total magnification (relative to your eye) of a sample imaged with a 20x
objective and a 15x eyepiece? Show your math.—ANSWER-20 x 15 = 300x magnification
True or false: Staining is often required to image a cell that is adherent and flat.—ANSWER-
True
Which of the following could be seen clearly by the unaided eye? Select all that apply.—
ANSWER-Skin cell with diameter of 1500mm; Protozoa with a diameter of 250 mm
