BIOD 171 EXAM 3 STUDY EXAM WITH
CORRECT QUESTIONS AND ANSWERS
2025
True or False: A nanometer (10-9) is longer than a micrometer (10-6). -
CORRECT-ANSWERSFalse; A nanometer is 1,000 times smaller than
a micrometer.
Resolution and contrast are two critical factors that influence your ability to
see an object. Explain each. - CORRECT-ANSWERSResolution is the
difference in distance between two objects that appear as two
separate objects.
Contrast is the difference in light absorption by an object.
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
microscope. - CORRECT-ANSWERSIris diaphragm
What is the total magnification (relative to your eye) of a sample imaged
with a 60x objective and a 10x eyepiece? Show your math. - CORRECT-
ANSWERS60 x 10 = 600x magnification
True or False: Staining is often required to image a cell that is adherent and
flat (thin). - CORRECT-ANSWERSTrue
Which of the following could NOT be seen clearly by the unaided eye? Select
all that apply. - CORRECT-ANSWERSBacteria with diameter of 24 μm
CORRECT QUESTIONS AND ANSWERS
2025
True or False: A nanometer (10-9) is longer than a micrometer (10-6). -
CORRECT-ANSWERSFalse; A nanometer is 1,000 times smaller than
a micrometer.
Resolution and contrast are two critical factors that influence your ability to
see an object. Explain each. - CORRECT-ANSWERSResolution is the
difference in distance between two objects that appear as two
separate objects.
Contrast is the difference in light absorption by an object.
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
microscope. - CORRECT-ANSWERSIris diaphragm
What is the total magnification (relative to your eye) of a sample imaged
with a 60x objective and a 10x eyepiece? Show your math. - CORRECT-
ANSWERS60 x 10 = 600x magnification
True or False: Staining is often required to image a cell that is adherent and
flat (thin). - CORRECT-ANSWERSTrue
Which of the following could NOT be seen clearly by the unaided eye? Select
all that apply. - CORRECT-ANSWERSBacteria with diameter of 24 μm
