Docsity
Log inSign up
Docsity
Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity

Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan

Guidelines and tips
Guidelines and tips
Sell on Docsity
Sell on Docsity
Log inSign up

Prepare for your exams

Study with the several resources on Docsity

Find documents

Prepare for your exams with the study notes shared by other students like you on Docsity

Search Store documents

The best documents sold by students who completed their studies

Search through all study resources
Docsity AINEW

Summarize your documents, ask them questions, convert them into quizzes and concept maps

Explore questions

Clear up your doubts by reading the answers to questions asked by your fellow students

Earn points to download

Earn points by helping other students or get them with a premium plan

Share documents
download point icon20 Points

For each uploaded document

Answer questions
download point icon5 Points

For each given answer (max 1 per day)

All the ways to get free points
Get points immediately

Choose a premium plan with all the points you need

Study Opportunities

Choose your next study program

Get in touch with the best universities in the world. Search through thousands of universities and official partners

Community

Ask the community

Ask the community for help and clear up your study doubts

University Rankings

Discover the best universities in your country according to Docsity users

Free resources

Our save-the-student-ebooks!

Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors

From our blog

Exams and Study
Go to the blog

BIOD 151 Portage Learning Microbiology Module 3 (2025) Exam With Actual Questions And Answ, Exams of Nutrition

Lehigh University (LU)Nutrition

A nanometer is defined as: ✔✔10-9 A nanometer is defined as one-billionth of a meter True or False: A nanometeris longer than a micrometer ✔✔False. 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. ✔✔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.

Typology: Exams

2024/2025

Available from 12/12/2024

Holygrams
Holygrams 🇺🇸

3.7

(3)

2.2K documents

1 / 6

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
A nanometer is defined as: ✔✔10-9
A nanometer is defined as one-billionth of a meter
True or False: A nanometeris longer than a micrometer ✔✔False. 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. ✔✔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).
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. ✔✔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.
BIOD 151 Portage Learning
Microbiology Module 3 (2025) Exam
With Actual Questions And Answers
100% Solved Graded A+
pf3
pf4
pf5

Partial preview of the text

Download BIOD 151 Portage Learning Microbiology Module 3 (2025) Exam With Actual Questions And Answ and more Exams Nutrition in PDF only on Docsity!

A nanometer is defined as: ✔✔ 10 - 9 A nanometer is defined as one-billionth of a meter True or False: A nanometeris longer than a micrometer ✔✔False. 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. ✔✔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). 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. ✔✔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.

BIOD 151 Portage Learning

Microbiology Module 3 (2025) Exam

With Actual Questions And Answers

100% Solved Graded A+

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 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 samp Which of the following could NOT be seen clearly by the unaided eye? Select all that apply. ✔✔24um and 0.2um. The unaided eye can, on average, clearly resolve objects > 100 μm This type of microscope utilizes ultraviolet (UV) light to illuminate stained objects. ✔✔Fluorescence This type of microscope uses a specialized condenser and objective to amplify the slight differences between cells and background ✔✔Phase-Contrast his type of microscope enhances contrast between specimen and background but does not permit the visualization of intracellular structures ✔✔Dark Field This type of microscope uses neither halogen nor UV light sources but rather lasers to illuminate stained cells in high resolution ✔✔Confocal

You suspect a patient may have TB. Once a sample has been obtained it is sent off to the lab for an acid-fast stain. If the patient were infected with TB, describe what you would expect to see on the stained slide. ✔✔You would expect to see red cells (TB+) on a blue background (TB negative). true or False: If a patient is suspected of having malaria, a Giemsa stain would be an appropriate differential test to perform. ✔✔True. Giemsa stains are often used in the clinical setting to aid in the diagnosis of blood parasites. Define the measurements micrometer and nanometer. ✔✔A micrometer (μm) is defined as being one-millionth of a meter and is commonly designated at 10- 6 meters. A nanometer (nm) equals 10 - 9 m or one-billionth of a meter. What are the two critical factors that influence your ability to see an object? ✔✔Resolution and 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. The 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).

As light passes through a microscope, what is the last piece that light passes before reaching your eyes? ✔✔Once light passes through the sample and the objective lens it is directed through the ocular lens, or eyepiece, directly into your eye. What is one limitation of fixing your sample? ✔✔Fixation requires you to irreversibly kill your sample. Thus, determining the motility (cell movement) of a sample is impossible. Fixation also runs the risk of distorting the specimen shape and arrangement. Phase-contrast microscopy provided what benefits to imaging? ✔✔Phase contrast microscope can provide detailed images of live cells without staining. By using specialized condensers and objectives, a phase contrast microscope amplifies the slight differences between cells and the surrounding medium (background) to make the cells highly distinguishable. What is the distinguishing feature of dark field microscopy? ✔✔Unlike bright field or phase contrast microscopy where light passes directly through the sample, dark field microscopy reflects light off of the specimen at an angle. The resulting image is an exceptionally dark background and a vibrant specimen. Unlike brightfield microscope, fluorescence microscopes illuminate samples through what spectrum? ✔✔The energy of the incoming light is in the form of the ultraviolet (UV) spectrum.