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BIOL 271 MICROBIOLOGY W/LAB MODULE 3 EXAM REVIEW PORTAGE LEARNING QUESTIONS AND CORRECT ANSWERS LATEST UPDATE 2026 .

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1. A micrometer is defined as CORRECT ANSWER 10^-6 2. Resolution and contrast are two critical factors that influence your ability to see an object. Explain each. CORRECT ANSWER Resolution is the distance between objects at which they appear separate. Poor resolution can show two or more objects as just one. Contrast is the ditterence in light absorption between two objects. Poor contrast can make the visualization of multiple object diflcult. 3. Assuming a fixed ocular, identify the part ofthemicroscope youwould adjust to enhance the magnification of a sample. CORRECT ANSWER Objective 4. What is the total magnification (relative to your eye) of a sample imaged with a 60x objective and a 10x eyepiece? CORRECT ANSWER 10 x 60 = 600x 5. True or false CORRECT ANSWER A cell that is adherent, flat, and unstained is easily identified using bright field microscopy. CORRECT ANSWER False. Adherent, flat cells are almost invisible due to the limits on both resolution and contrast. 6. Which ofthe following could be seen clearly by the unaided eye. Select all that apply. A. Virus with a diameter of 0.2micrometers B. Bacteria with a diameter of 24 micrometers C. Skin cell with a diameter of 1500micrometers D. Protozoa with a diameter of 150 micrometers CORRECT ANSWER C and D. The unaided eye can see objects 150 micrometers. 7. Label the following microscope components. Answers CORRECT ANSWER 1. F 2. D 3. B 4. G 5. A 6. H CORRECT ANSWER Options CORRECT ANSWER A. Stage B. Fine adjustment knob C. Iris dia

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BIOL 271 MICROBIOLOGY
W/LAB MODULE 3 EXAM
REVIEW PORTAGE LEARNING
QUESTIONS AND CORRECT
ANSWERS LATEST UPDATE
2026 .

, 1. A micrometer is defined as✔✔ CORRECT ANSWER 10^-6

2. Resolution and contrast are two critical factors that influence your ability to see an object. Explain each.✔✔ CORRECT ANSWER

Resolution is the distance between objects at which they appear separate. Poor resolution can show two or more objects as just one.



Contrast is the ditterence in light absorption between two objects. Poor contrast can make the visualization of multiple object diflcult.

3. Assuming a fixed ocular, identify the part of the microscope you would adjust to enhance the magnification of a sample.✔✔

CORRECT ANSWER Objective

4. What is the total magnification (relative to your eye) of a sample imaged with a 60x objective and a 10x eyepiece?✔✔

CORRECT ANSWER 10 x 60 = 600x

5. True or false✔✔ CORRECT ANSWER A cell that is adherent, flat, and unstained is easily identified using bright field

microscopy.✔✔ CORRECT ANSWER False. Adherent, flat cells are almost invisible due to the limits on both

resolution and contrast.

6. Which of the following could be seen clearly by the unaided eye. Select all that apply.



A. Virus with a diameter of 0.2 micrometers

B. Bacteria with a diameter of 24 micrometers

C. Skin cell with a diameter of 1500 micrometers

D. Protozoa with a diameter of 150 micrometers✔✔ CORRECT ANSWER C and D. The unaided eye can see objects

>150 micrometers.

7. Label the following microscope components. Answers✔✔ CORRECT

ANSWER

1. F

2. D

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