Exam (elaborations)
Bio 171 Module 3 exam.
- Course
- Institution
Bio 171 Module 3 exam/Bio 171 Module 3 exam/Bio 171 Module 3 exam.
[Show more]
Seller
Follow
Toppnurse
Reviews received
Content preview
Exam 3. A nanometer is defined as:
A. 10-3
B. 10-6
C.10-9
D. 10-12 C. A nanometer is defined as one-billionth of a meter.
2. True or False: A nanometeris longer than a micrometer. False. A nanometer is 1,000 times
smaller than a micrometer.
1. Resolution and contrast are two critical factors that influence your ability to see an object. Explain
each. 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).
1. 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.
A. Objective
B. Condenser
C. Iris diaphragm
D. Eye piece
C. 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.
2. What is the total magnification (relative to your eye) of a sample imaged with a 60x objective and
a 10x eyepiece? Show your math. 60 x 10 = 600x magnification
1. True or False: Staining is often required to image a cell that is adherent and flat (thin). 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.
2. Which of the following could NOT be seen clearly by the unaided eye? Select all that apply.
A. Bacteria with diameter of 24 μm
This study source was downloaded by 100000849580189 from CourseHero.com on 07-17-2023 07:34:46 GMT -05:00
https://www.coursehero.com/file/39096969/Bio-171-Module-3-examdocx/
, B. Protozoa with diameter of 150 μm
C. Virus with a diameter of 0.2 μm
D. Skin cell with diameter of 1500 μm
A and C. The unaided eye can, on average, clearly resolve objects > 100 μm
1. Label the following unmarked microscope components (numbered arrows) by matching it with the
components provided (letters).
A. Stage
This study source was downloaded by 100000849580189 from CourseHero.com on 07-17-2023 07:34:46 GMT -05:00
https://www.coursehero.com/file/39096969/Bio-171-Module-3-examdocx/
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Toppnurse. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $8.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
80796 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now