BIOD 171 Module 3 Exam Questions And Answers
(Graded 100 out 100points).
Score for this quiz: 100 out of 100
Submitted Apr 19 at 8:09pm
This
... [Show More] attempt took 33 minutes.
Question 1 5 / 5 pts
A nanometer is defined as:
A. 10
B. 10
C. 10
D. 10
-3
-6
-9
-12
A.
D.
C. Correct!
B.
5/1/22, 6:13 PM M3: Module 3 Exam - Requires Respondus LockDown Browser + Webcam: Essential Microbiology with Lab-2021-Bowman
https://nursingabc.instructure.com/courses/902/quizzes/23556?module_item_id=135784 2/15
Question 2 10 / 10 pts
Your Answer:
Resolution and contrast are two critical factors that influence your ability
to see an object. Explain each.
Resolution is the distance between two objects in which the objects can
still be seen as separate. A poor resulution will result to two or more
objects appearing as one
Contrast is the difference in light absorbance between two objects. Whe
there is poor contrast, it results to a high bacground and makes
visualization difficult because you are unable to contrast between the
background and the object you are observing. For example poor contrast
is illustrated by looking at two dark objects in the dark which makes it
difficult unlike looking at dark coloured objects in bright sunlight; this is a
good contrast
Resolution refers to the distance between two objects at
which the objects still 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
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).
Question 3 3 / 3 pts
5/1/22, 6:13 PM M3: Module 3 Exam - Requires Respondus LockDown Browser + Webcam: Essential Microbiology with Lab-2021-Bowman
https://nursingabc.instructure.com/courses/902/quizzes/23556?module_item_id=135784 3/15
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.
Select all that apply.
Condenser
Objective
Eye piece
Iris diaphragm Correct!
The iris controls the amount of light that passes through the sample
and into the objective lens. Thus, it can be adjusted (opened or
closed) to alter the amount of light.
Question 4 5 / 5 pts
Your Answer:
What is the total magnification (relative to your eye) of a sample imaged
with a 60x objective and a 10x eyepiece? Show your math.
Total Magnification = Objective x Eyepiece = 60 x 10 = 600x larger
60 x 10 = 600x magnification
Question 5 3 / 3 pts
5/1/22, 6:13 PM M3: Module 3 Exam - Requires Respondus LockDown Browser + Webcam: Essential Microbiology with Lab-2021-Bowman
https://nursingabc.instructure.com/courses/902/quizzes/23556?module_item_id=135784 4/15
True or False: A cell that is adherent, flat (thin), and unstained is easily
identified using bright field microscopy.
True
False Correct!
Adherent, flat cells are almost invisible due to the limits on both
resolution and contrast. [Show Less]