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BIOS 255 LAB PRACTICAL EXAM 1 (Latest Update 2025 / 2026) Anatomy and Physiology IV with Lab | Questions & Answers | 100% Correct | Grade A – Chamberlain

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BIOS 255 LAB PRACTICAL EXAM 1 (Latest Update 2025 / 2026) Anatomy and Physiology IV with Lab | Questions & Answers | 100% Correct | Grade A – Chamberlain

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BIOS 255 LAB PRACTICAL EXAM 1 (Latest
Update ) Anatomy and
Physiology IV with Lab | Questions &
Answers | 100% Correct | Grade A –
Chamberlain

1. Which microscope part is used to adjust the focus at high
r. r. r. r. r. r. r. r. r. r.




r. power?

A. Coarse adjustment knob
r. r. r.




B. Fine adjustment knob
r. r. r.




C. Stage clip
r. r.




D. Diaphragm
r.




Correct Answer: B r. r.




Rationale: The fine adjustment knob allows precise focusing at
r. r. r. r. r. r. r. r.




high magnification.
r. r.




2. The function of the diaphragm on a microscope is to:
r. r. r. r. r. r. r. r. r. r.




A. Adjust light intensity and contrast
r. r. r. r. r.




B. Move the stage
r. r. r.




C. Change magnification
r. r.




D. Hold slides
r. r.




Correct Answer: A r. r.

,Rationale: The diaphragm controls how much light passes through
r. r. r. r. r. r. r. r.




r. the specimen.
r.




3. When carrying a microscope, you should:
r. r. r. r. r. r.




A. Hold by the base only
r. r. r. r. r.




B. Hold by the arm and base
r. r. r. r. r. r.




C. Carry with one hand on the stage
r. r. r. r. r. r. r.




D. Drag it across the table
r. r. r. r. r.




Correct Answer: B r. r.




Rationale: Proper handling prevents damage; always support the
r. r. r. r. r. r. r.




r. arm and base. r. r.




4. Which stain is commonly used for identifying bacteria?
r. r. r. r. r. r. r. r.




A. Gram stain
r. r.




B. Methylene blue
r. r.




C. Iodine
r.




D. Hematoxylin
r.




Correct Answer: A r. r.




Rationale: Gram stain differentiates bacteria into Gram-positive
r. r. r. r. r. r.




r. and Gram-negative.
r.




5. The correct sequence for using a microscope is:
r. r. r. r. r. r. r. r.




A. Start with high power → coarse focus → low power
r. r. r. r. r. r. r. r. r. r.




B. Place slide → low power → coarse focus → fine focus → increase
r. r. r. r. r. r. r. r. r. r. r. r. r.




magnification
r.

,C. Place slide → high power → coarse focus → fine focus
r. r. r. r. r. r. r. r. r. r. r.




D. Low power → remove slide → fine focus
r. r. r. r. r. r. r. r.




Correct Answer: B r. r.




Rationale: Always start with low power to locate the specimen, then
r. r. r. r. r. r. r. r. r. r.




fine focus at higher magnifications.
r. r. r. r. r.




6. What is the function of a coverslip?
r. r. r. r. r. r. r.




A. Protects the specimen and objective lens
r. r. r. r. r. r.




B. Increases magnification
r. r.




C. Stains cells
r. r.




D. Moves the slide
r. r. r.




Correct Answer: A r. r.




Rationale: Coverslips flatten the specimen and prevent lens
r. r. r. r. r. r. r.




damage.
r.




7. Which organelle is best observed under a light microscope?
r. r. r. r. r. r. r. r. r.




A. Nucleus
r.




B. Ribosome
r.




C. Mitochondria
r.




D. Golgi apparatus
r. r.




Correct Answer: A r. r.




Rationale: Nuclei are large enough to be seen with a standard light
r. r. r. r. r. r. r. r. r. r. r.




microscope.
r.




8. When preparing a wet mount, you should:
r. r. r. r. r. r. r.

, A. Place a drop of water on the slide, add specimen, cover with
r. r. r. r. r. r. r. r. r. r. r. r.




coverslip
r.




B. Heat the slide first
r. r. r. r.




C. Stain before adding water
r. r. r. r.




D. Skip the coverslip
r. r. r.




Correct Answer: A r. r.




Rationale: Wet mounts allow observation of live cells and their
r. r. r. r. r. r. r. r. r.




movement.
r.




9. Which type of microscope is used to view detailed surface
r. r. r. r. r. r. r. r. r. r.




r. structures of cells? r. r.




A. Scanning electron microscope
r. r. r.




B. Light microscope
r. r.




C. Compound microscope
r. r.




D. Stereoscope
r.




Correct Answer: A r. r.




Rationale: SEM provides 3D images of cell surfaces at high
r. r. r. r. r. r. r. r. r.




r. resolution.

10. Which solution is used to stain nuclei blue in plant cells?
r. r. r. r. r. r. r. r. r. r. r.




A. Iodine
r.




B. Methylene blue
r. r.




C. Safranin
r.




D. Crystal violet
r. r.

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