HBIO 202 LAB FINAL EXAM Actual Exam Complete
Questions and Answers Detailed Rationales Pass
Guaranteed - A+ Graded
TABLE OF CONTENTS
Section 1 | Lab Safety, Equipment & Microscopy | Q1 – Q10
Section 2 | Cellular Biology & Histology | Q11 – Q20
Section 3 | Skeletal & Muscular Systems | Q21 – Q30
Section 4 | Cardiovascular & Respiratory Physiology | Q31 – Q40
Section 5 | Neuroanatomy, Sensory Physiology & Data Interpretation | Q41 – Q50
Instructions: Choose the single best answer. Pass: 80% in 90 minutes.
══════════════════════════════════════
SECTION 1: LAB SAFETY, EQUIPMENT & MICROSCOPY Q1 – Q10
══════════════════════════════════════
Question 1 of 50
A student gets a drop of 10% formaldehyde splashed into their left eye while
transferring a specimen jar. They immediately rub their eye with a paper towel and ask if
they should finish the lab session.
A. Continue the lab since formaldehyde is only dangerous if ingested in large quantities.
B. Proceed immediately to the eyewash station and flush the eye for at least 15 minutes
while holding the eyelids open. ✓ CORRECT
C. Neutralize the chemical by applying a weak base such as sodium bicarbonate
solution to the eye.
D. Rinse the eye briefly with tap water from the sink for 30 seconds and return to the
bench.
Correct Answer: B
,Rationale: Formaldehyde is a tissue fixative and severe eye irritant that requires
immediate and prolonged irrigation at the eyewash station to prevent corneal damage.
Rubbing the eye with a paper towel can embed fibers and drive the chemical deeper into
tissues, worsening the injury. All chemical splashes to the eyes should be treated as
emergencies regardless of the perceived concentration.
Question 2 of 50
A student is examining a blood smear under high power (40x) and notices faint
structures near the margin of a red blood cell. They want to switch to oil immersion to
see greater detail.
A. Rotate the 100x oil immersion objective into place first, then add a drop of immersion
oil to the slide from above.
B. Add immersion oil directly onto the 40x objective lens before swinging the nosepiece
to the 100x objective.
C. Use the coarse focus knob to bring the 100x objective as close to the slide as
possible before adding oil.
D. Add a drop of immersion oil to the coverslip, then rotate the nosepiece to bring the
100x objective into the oil. ✓ CORRECT
Correct Answer: D
Rationale: Immersion oil must be placed on the specimen before the 100x objective is
rotated into position so the lens contacts the oil directly and maintains optical coupling
without crashing into the slide. Adding oil to the 40x objective or using coarse focus
with high power risks damaging the lens and the specimen. The 100x objective is
parfocal with lower powers, so only fine focus should be needed after the oil is in place.
Question 3 of 50
A lab instructor asks students to verify that a pack of glass pipettes has been properly
sterilized in the autoclave before use in a tissue culture experiment.
,A. Check that the autoclave indicator tape on the packaging has changed color from
beige to dark brown or black. ✓ CORRECT
B. Confirm the pipettes are sterile because the autoclave chamber reached 100°C
during the cycle.
C. Open the packaging immediately after the cycle ends to allow steam to escape and
verify dryness.
D. Rinse the pipettes with 70% ethanol after removal from the autoclave to ensure
sterility.
Correct Answer: A
Rationale: Autoclave indicator tape contains heat-sensitive dyes that change color when
exposed to the combination of temperature, pressure, and steam required for
sterilization, providing visual confirmation that the pack reached adequate conditions.
An autoclave cycle requires 121°C and 15 psi pressure, not 100°C, and opening hot
packs immediately can cause condensation and compromise sterility. Rinsing sterile
items with ethanol after autoclaving recontaminates them.
Question 4 of 50
During a lab safety inspection, a graduate student is asked where to find the health
hazard information for the methanol used in the lipid extraction protocol.
A. The information is printed on the bottle label only, as manufacturers are not required
to provide additional documentation.
B. The lab notebook contains all safety data because the principal investigator
summarized the hazards last semester.
C. The Safety Data Sheet for methanol must be accessible in the lab or via the
institution's chemical management system. ✓ CORRECT
D. Hazard information is available only from the local fire department's hazardous
materials response team.
Correct Answer: C
Rationale: OSHA's Hazard Communication Standard requires that Safety Data Sheets be
readily accessible to employees for every hazardous chemical in the workplace, and
, methanol's flammability and toxicity data must be available before use. Relying solely
on bottle labels or outdated notebook summaries does not satisfy regulatory
requirements and may miss critical first-aid or spill-response information. Most
universities now maintain electronic SDS databases that can be accessed by barcode or
chemical name.
Question 5 of 50
A student needs to transfer 250 µL of enzyme buffer into a microcentrifuge tube and
selects a P1000 micropipette set to 250.
A. The P1000 is ideal for this volume because its maximum capacity of 1000 µL
includes 250 µL within its optimal range.
B. A P200 or P1000 set to 250 is acceptable, though a P200 offers better precision at
the upper end of its range. ✓ CORRECT
C. The student should use a P20 micropipette and perform twelve transfers of
approximately 20 µL each.
D. The P1000 cannot be used below 500 µL and the student must borrow a different
pipette.
Correct Answer: B
Rationale: While a P1000 can deliver 250 µL, micropipettes are most accurate in the
middle to upper portion of their range, so a P200 would provide tighter precision and
lower coefficient of variation for this volume. Using a P20 for multiple small aliquots
introduces cumulative error and increases contamination risk, and the P1000 minimum
is typically 100–200 µL, not 500 µL. Proper technique includes selecting the smallest
pipette that comfortably covers the target volume.
Question 6 of 50
A student is examining a stained whole-mount of a planarian under a dissecting
microscope and notices that the image is dark and lacks contrast even with the light
source at maximum intensity.
Questions and Answers Detailed Rationales Pass
Guaranteed - A+ Graded
TABLE OF CONTENTS
Section 1 | Lab Safety, Equipment & Microscopy | Q1 – Q10
Section 2 | Cellular Biology & Histology | Q11 – Q20
Section 3 | Skeletal & Muscular Systems | Q21 – Q30
Section 4 | Cardiovascular & Respiratory Physiology | Q31 – Q40
Section 5 | Neuroanatomy, Sensory Physiology & Data Interpretation | Q41 – Q50
Instructions: Choose the single best answer. Pass: 80% in 90 minutes.
══════════════════════════════════════
SECTION 1: LAB SAFETY, EQUIPMENT & MICROSCOPY Q1 – Q10
══════════════════════════════════════
Question 1 of 50
A student gets a drop of 10% formaldehyde splashed into their left eye while
transferring a specimen jar. They immediately rub their eye with a paper towel and ask if
they should finish the lab session.
A. Continue the lab since formaldehyde is only dangerous if ingested in large quantities.
B. Proceed immediately to the eyewash station and flush the eye for at least 15 minutes
while holding the eyelids open. ✓ CORRECT
C. Neutralize the chemical by applying a weak base such as sodium bicarbonate
solution to the eye.
D. Rinse the eye briefly with tap water from the sink for 30 seconds and return to the
bench.
Correct Answer: B
,Rationale: Formaldehyde is a tissue fixative and severe eye irritant that requires
immediate and prolonged irrigation at the eyewash station to prevent corneal damage.
Rubbing the eye with a paper towel can embed fibers and drive the chemical deeper into
tissues, worsening the injury. All chemical splashes to the eyes should be treated as
emergencies regardless of the perceived concentration.
Question 2 of 50
A student is examining a blood smear under high power (40x) and notices faint
structures near the margin of a red blood cell. They want to switch to oil immersion to
see greater detail.
A. Rotate the 100x oil immersion objective into place first, then add a drop of immersion
oil to the slide from above.
B. Add immersion oil directly onto the 40x objective lens before swinging the nosepiece
to the 100x objective.
C. Use the coarse focus knob to bring the 100x objective as close to the slide as
possible before adding oil.
D. Add a drop of immersion oil to the coverslip, then rotate the nosepiece to bring the
100x objective into the oil. ✓ CORRECT
Correct Answer: D
Rationale: Immersion oil must be placed on the specimen before the 100x objective is
rotated into position so the lens contacts the oil directly and maintains optical coupling
without crashing into the slide. Adding oil to the 40x objective or using coarse focus
with high power risks damaging the lens and the specimen. The 100x objective is
parfocal with lower powers, so only fine focus should be needed after the oil is in place.
Question 3 of 50
A lab instructor asks students to verify that a pack of glass pipettes has been properly
sterilized in the autoclave before use in a tissue culture experiment.
,A. Check that the autoclave indicator tape on the packaging has changed color from
beige to dark brown or black. ✓ CORRECT
B. Confirm the pipettes are sterile because the autoclave chamber reached 100°C
during the cycle.
C. Open the packaging immediately after the cycle ends to allow steam to escape and
verify dryness.
D. Rinse the pipettes with 70% ethanol after removal from the autoclave to ensure
sterility.
Correct Answer: A
Rationale: Autoclave indicator tape contains heat-sensitive dyes that change color when
exposed to the combination of temperature, pressure, and steam required for
sterilization, providing visual confirmation that the pack reached adequate conditions.
An autoclave cycle requires 121°C and 15 psi pressure, not 100°C, and opening hot
packs immediately can cause condensation and compromise sterility. Rinsing sterile
items with ethanol after autoclaving recontaminates them.
Question 4 of 50
During a lab safety inspection, a graduate student is asked where to find the health
hazard information for the methanol used in the lipid extraction protocol.
A. The information is printed on the bottle label only, as manufacturers are not required
to provide additional documentation.
B. The lab notebook contains all safety data because the principal investigator
summarized the hazards last semester.
C. The Safety Data Sheet for methanol must be accessible in the lab or via the
institution's chemical management system. ✓ CORRECT
D. Hazard information is available only from the local fire department's hazardous
materials response team.
Correct Answer: C
Rationale: OSHA's Hazard Communication Standard requires that Safety Data Sheets be
readily accessible to employees for every hazardous chemical in the workplace, and
, methanol's flammability and toxicity data must be available before use. Relying solely
on bottle labels or outdated notebook summaries does not satisfy regulatory
requirements and may miss critical first-aid or spill-response information. Most
universities now maintain electronic SDS databases that can be accessed by barcode or
chemical name.
Question 5 of 50
A student needs to transfer 250 µL of enzyme buffer into a microcentrifuge tube and
selects a P1000 micropipette set to 250.
A. The P1000 is ideal for this volume because its maximum capacity of 1000 µL
includes 250 µL within its optimal range.
B. A P200 or P1000 set to 250 is acceptable, though a P200 offers better precision at
the upper end of its range. ✓ CORRECT
C. The student should use a P20 micropipette and perform twelve transfers of
approximately 20 µL each.
D. The P1000 cannot be used below 500 µL and the student must borrow a different
pipette.
Correct Answer: B
Rationale: While a P1000 can deliver 250 µL, micropipettes are most accurate in the
middle to upper portion of their range, so a P200 would provide tighter precision and
lower coefficient of variation for this volume. Using a P20 for multiple small aliquots
introduces cumulative error and increases contamination risk, and the P1000 minimum
is typically 100–200 µL, not 500 µL. Proper technique includes selecting the smallest
pipette that comfortably covers the target volume.
Question 6 of 50
A student is examining a stained whole-mount of a planarian under a dissecting
microscope and notices that the image is dark and lacks contrast even with the light
source at maximum intensity.
