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BIOD 171 MODULE 3 FINAL EXAM| 2025-2026 LATEST UPDATED |
ACTUAL EXAM QUESTIONS WITH SOLUTIONS | 100% RATED
CORRECT | 100% VERFIED SOLTIONS | ALREADY GRADED A+
A nanometer is defined as: - (ANSWER)10 -9 or one-billionth of a meter
True or False: A nanometer is longer than a micrometer - (ANSWER)False
A nanometer is 1000x smaller than a micrometer
Resolution and contrast are two critical factors that influence your ability to see an object.
Explain each. - (ANSWER)Resolution refers to the distance between two objects at which the
objects can still be seen as separate. Poor or low resolution means two or more objects may
appear as one.
Contrast on the other hand is the difference in light absorbance between two objects. Poor
contrast gives a high background and makes the visualization of multiple objects difficult. For
instance, trying to identify 2 dark colored objects at
night (low light = low contrast) versus the same 2 objects in the middle of
a sunny afternoon (bright light against 2 dark objects = high contrast).
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Assuming a fixed ocular, identify the part of the microscope you would adjust to enhance the
magnification of a sample. - (ANSWER)Objective
Only the oculars (eyepiece) and the objectives contribute to the magnification of the sample.
Since the eyepiece
is fixed, only the objectives could be altered.
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. - (ANSWER)Iris diaphragm
What is the total magnification on (relative to your eye) of a sample imaged with a 60x objective
and a 10x eyepiece? Show your math. - (ANSWER)60x objective x 10x ocular = 600x
magnification
True or False: Staining is often required to image a cell that is adherent and flat (thin). -
(ANSWER)True
Adherent, flat and unstained cells are almost invisible due to the limits on both
resolution and contrast. Therefore, cell staining is often required to adequately image
the sample.
BIOD 171 MODULE 3 FINAL EXAM| 2025-2026 LATEST UPDATED |
ACTUAL EXAM QUESTIONS WITH SOLUTIONS | 100% RATED
CORRECT | 100% VERFIED SOLTIONS | ALREADY GRADED A+
A nanometer is defined as: - (ANSWER)10 -9 or one-billionth of a meter
True or False: A nanometer is longer than a micrometer - (ANSWER)False
A nanometer is 1000x smaller than a micrometer
Resolution and contrast are two critical factors that influence your ability to see an object.
Explain each. - (ANSWER)Resolution refers to the distance between two objects at which the
objects can still be seen as separate. Poor or low resolution means two or more objects may
appear as one.
Contrast on the other hand is the difference in light absorbance between two objects. Poor
contrast gives a high background and makes the visualization of multiple objects difficult. For
instance, trying to identify 2 dark colored objects at
night (low light = low contrast) versus the same 2 objects in the middle of
a sunny afternoon (bright light against 2 dark objects = high contrast).
, 2|Page
Assuming a fixed ocular, identify the part of the microscope you would adjust to enhance the
magnification of a sample. - (ANSWER)Objective
Only the oculars (eyepiece) and the objectives contribute to the magnification of the sample.
Since the eyepiece
is fixed, only the objectives could be altered.
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. - (ANSWER)Iris diaphragm
What is the total magnification on (relative to your eye) of a sample imaged with a 60x objective
and a 10x eyepiece? Show your math. - (ANSWER)60x objective x 10x ocular = 600x
magnification
True or False: Staining is often required to image a cell that is adherent and flat (thin). -
(ANSWER)True
Adherent, flat and unstained cells are almost invisible due to the limits on both
resolution and contrast. Therefore, cell staining is often required to adequately image
the sample.
