BIOS 251 Lab Practical Exam final (Latest
Update ) Anatomy and
Physiology IV with Lab | Questions &
Answers | 100% Correct | Grade A -
Chamberlain
1. Which microscope lens is used to initially scan a specimen?
A. 4x
B. 10x
C. 40x
D. 100x
Correct answer: A
Rationale: The 4x objective provides the widest field of view for
locating specimens.
2. Which pipette is designed for precise microliter measurements?
A. Micropipette
B. Volumetric pipette
C. Pasteur pipette
D. Graduated pipette
,Correct answer: A
Rationale: Micropipettes allow accurate transfer of very small
volumes.
3. Which reagent detects the presence of protein?
A. Biuret reagent
B. Benedict’s solution
C. Iodine
D. Sudan III
Correct answer: A
Rationale: Proteins react with Biuret reagent to form a purple
complex.
4. Which stain is used to detect lipids in cells?
A. Sudan III
B. Hematoxylin
C. Eosin
D. Iodine
Correct answer: A
Rationale: Sudan III binds to lipids and stains them red-orange.
5. Which technique separates plasma from red blood cells?
A. Centrifugation
B. Filtration
,C. Chromatography
D. Microscopy
Correct answer: A
Rationale: Centrifugation separates blood components based on
density.
6. Which stain differentiates nuclei from cytoplasm?
A. Hematoxylin & Eosin
B. Sudan III
C. Benedict’s solution
D. Iodine
Correct answer: A
Rationale: Hematoxylin stains nuclei blue; Eosin stains cytoplasm
pink.
7. Which solution tests for reducing sugars?
A. Benedict’s solution
B. Biuret reagent
C. Iodine
D. Sudan III
Correct answer: A
Rationale: Reducing sugars reduce copper ions producing a colored
precipitate.
, 8. Which microscope part holds the objective lenses?
A. Nosepiece
B. Stage
C. Arm
D. Base
Correct answer: A
Rationale: The nosepiece rotates to switch between objectives.
9. Which microscope component regulates light intensity?
A. Diaphragm
B. Stage
C. Nosepiece
D. Arm
Correct answer: A
Rationale: The diaphragm adjusts the amount of light passing
through the specimen.
10. Which pipette is suitable for fixed 10 mL volumes?
A. Volumetric pipette
B. Micropipette
C. Pasteur pipette
D. Graduated pipette
Update ) Anatomy and
Physiology IV with Lab | Questions &
Answers | 100% Correct | Grade A -
Chamberlain
1. Which microscope lens is used to initially scan a specimen?
A. 4x
B. 10x
C. 40x
D. 100x
Correct answer: A
Rationale: The 4x objective provides the widest field of view for
locating specimens.
2. Which pipette is designed for precise microliter measurements?
A. Micropipette
B. Volumetric pipette
C. Pasteur pipette
D. Graduated pipette
,Correct answer: A
Rationale: Micropipettes allow accurate transfer of very small
volumes.
3. Which reagent detects the presence of protein?
A. Biuret reagent
B. Benedict’s solution
C. Iodine
D. Sudan III
Correct answer: A
Rationale: Proteins react with Biuret reagent to form a purple
complex.
4. Which stain is used to detect lipids in cells?
A. Sudan III
B. Hematoxylin
C. Eosin
D. Iodine
Correct answer: A
Rationale: Sudan III binds to lipids and stains them red-orange.
5. Which technique separates plasma from red blood cells?
A. Centrifugation
B. Filtration
,C. Chromatography
D. Microscopy
Correct answer: A
Rationale: Centrifugation separates blood components based on
density.
6. Which stain differentiates nuclei from cytoplasm?
A. Hematoxylin & Eosin
B. Sudan III
C. Benedict’s solution
D. Iodine
Correct answer: A
Rationale: Hematoxylin stains nuclei blue; Eosin stains cytoplasm
pink.
7. Which solution tests for reducing sugars?
A. Benedict’s solution
B. Biuret reagent
C. Iodine
D. Sudan III
Correct answer: A
Rationale: Reducing sugars reduce copper ions producing a colored
precipitate.
, 8. Which microscope part holds the objective lenses?
A. Nosepiece
B. Stage
C. Arm
D. Base
Correct answer: A
Rationale: The nosepiece rotates to switch between objectives.
9. Which microscope component regulates light intensity?
A. Diaphragm
B. Stage
C. Nosepiece
D. Arm
Correct answer: A
Rationale: The diaphragm adjusts the amount of light passing
through the specimen.
10. Which pipette is suitable for fixed 10 mL volumes?
A. Volumetric pipette
B. Micropipette
C. Pasteur pipette
D. Graduated pipette
