BIOD 171 MODULE 3 EXAM /Q-BANK
/ COMPLETE ACCURATE
QUIZZESWITH VERIFIED ANSWERS /
.
Quiz____?
A nanometer is defined as: -
Answer✓✓
10 -9 or one-billionth of a meter
Quiz____?
True or False: A nanometer is longer than a micrometer -
Answer✓✓
False
A nanometer is 1000x smaller than a micrometer
Quiz____?
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.
1
, 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).
Quiz____?
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.
Quiz____?
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
Quiz____?
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
2
/ COMPLETE ACCURATE
QUIZZESWITH VERIFIED ANSWERS /
.
Quiz____?
A nanometer is defined as: -
Answer✓✓
10 -9 or one-billionth of a meter
Quiz____?
True or False: A nanometer is longer than a micrometer -
Answer✓✓
False
A nanometer is 1000x smaller than a micrometer
Quiz____?
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.
1
, 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).
Quiz____?
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.
Quiz____?
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
Quiz____?
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
2
