BIOS 251 Lab Practical Exam 3 (Latest
Update ) Anatomy and
Physiology IV with Lab | Questions &
Answers | 100% Correct | Grade A -
Chamberlain
1. Which part of the microscope moves the stage vertically for
focusing?
A. Coarse adjustment
B. Fine adjustment
C. Nosepiece
D. Diaphragm
Correct answer: A
Rationale: Coarse adjustment allows rapid vertical movement to
bring the specimen into rough focus.
2. Which solution tests for reducing sugars in a sample?
A. Benedict’s solution
B. Biuret reagent
C. Iodine
D. Sudan III
,Correct answer: A
Rationale: Reducing sugars reduce copper ions in Benedict’s
solution, forming a colored precipitate.
3. Which pipette is most precise for transferring microliters?
A. Micropipette
B. Volumetric pipette
C. Pasteur pipette
D. Graduated pipette
Correct answer: A
Rationale: Micropipettes allow accurate transfer of very small liquid
volumes.
4. Which stain highlights nuclei in histological samples?
A. Hematoxylin
B. Eosin
C. Sudan III
D. Iodine
Correct answer: A
Rationale: Hematoxylin binds to acidic nuclear components,
producing a blue-purple color.
5. Which lab technique separates plasma from blood cells?
,A. Centrifugation
B. Filtration
C. Chromatography
D. Spectrophotometry
Correct answer: A
Rationale: Centrifugation separates components by density.
6. Which microscope lens provides the highest magnification for
bacteria?
A. 100x (oil immersion)
B. 4x
C. 10x
D. 40x
Correct answer: A
Rationale: Oil immersion increases resolution and allows detailed
observation.
7. Which solution tests for protein?
A. Biuret reagent
B. Benedict’s solution
C. Iodine
D. Sudan III
, Correct answer: A
Rationale: Proteins react with Biuret reagent forming a purple
complex.
8. Which part of the microscope holds the objectives?
A. Nosepiece
B. Stage
C. Base
D. Arm
Correct answer: A
Rationale: The revolving nosepiece allows switching between
objective lenses.
9. Which stain detects lipids in tissue samples?
A. Sudan III
B. Hematoxylin
C. Eosin
D. Iodine
Correct answer: A
Rationale: Sudan III specifically stains lipids red-orange.
10. Which microscope component regulates light intensity?
A. Diaphragm
B. Stage
Update ) Anatomy and
Physiology IV with Lab | Questions &
Answers | 100% Correct | Grade A -
Chamberlain
1. Which part of the microscope moves the stage vertically for
focusing?
A. Coarse adjustment
B. Fine adjustment
C. Nosepiece
D. Diaphragm
Correct answer: A
Rationale: Coarse adjustment allows rapid vertical movement to
bring the specimen into rough focus.
2. Which solution tests for reducing sugars in a sample?
A. Benedict’s solution
B. Biuret reagent
C. Iodine
D. Sudan III
,Correct answer: A
Rationale: Reducing sugars reduce copper ions in Benedict’s
solution, forming a colored precipitate.
3. Which pipette is most precise for transferring microliters?
A. Micropipette
B. Volumetric pipette
C. Pasteur pipette
D. Graduated pipette
Correct answer: A
Rationale: Micropipettes allow accurate transfer of very small liquid
volumes.
4. Which stain highlights nuclei in histological samples?
A. Hematoxylin
B. Eosin
C. Sudan III
D. Iodine
Correct answer: A
Rationale: Hematoxylin binds to acidic nuclear components,
producing a blue-purple color.
5. Which lab technique separates plasma from blood cells?
,A. Centrifugation
B. Filtration
C. Chromatography
D. Spectrophotometry
Correct answer: A
Rationale: Centrifugation separates components by density.
6. Which microscope lens provides the highest magnification for
bacteria?
A. 100x (oil immersion)
B. 4x
C. 10x
D. 40x
Correct answer: A
Rationale: Oil immersion increases resolution and allows detailed
observation.
7. Which solution tests for protein?
A. Biuret reagent
B. Benedict’s solution
C. Iodine
D. Sudan III
, Correct answer: A
Rationale: Proteins react with Biuret reagent forming a purple
complex.
8. Which part of the microscope holds the objectives?
A. Nosepiece
B. Stage
C. Base
D. Arm
Correct answer: A
Rationale: The revolving nosepiece allows switching between
objective lenses.
9. Which stain detects lipids in tissue samples?
A. Sudan III
B. Hematoxylin
C. Eosin
D. Iodine
Correct answer: A
Rationale: Sudan III specifically stains lipids red-orange.
10. Which microscope component regulates light intensity?
A. Diaphragm
B. Stage
