ETHC 210: Ethics in Biotechnology
Quiz 1 — Practice Examination
Microscopic Examination of Cell Structure and Genetics Laboratory
25-Question Multiple-Choice Practice Exam
Liberty University
Department of Biology & Health Sciences
June 10, 2026
Instructions
This practice examination contains 25 multiple-choice questions organized into five sections:
Microscopy and Laboratory Techniques (Q1–6), Cell Structure and Organelles (Q7–12), The Cell
Cycle, Mitosis, and Meiosis (Q13–19), DNA Structure (Q20–23), and Christian Worldview
Integration (Q24–25). Each question is followed by the correct answer and a detailed rationale.
Select the single best answer for each question.
, ETHC 210 Quiz 1 Practice Exam
Part 1: Microscopy and Laboratory Techniques (Questions 1–6)
Question 1. If a light microscope has an ocular lens (eyepiece) with a magnification of 10x, and you
are viewing a specimen using the high-dry objective lens (40x), what is the total magnification?
A) 50x
B) 400x
C) 4000x
D) 140x
Correct Answer: B) 400x
Rationale: Total magnification = ocular lens × objective lens. 10 × 40 = 400x.
Question 2. Which term describes the ability of a microscope to distinguish two closely spaced
objects as separate and distinct, rather than just making them look bigger?
A) Magnification
B) Parfocality
C) Resolution (Resolving Power)
D) Working Distance
Correct Answer: C) Resolution (Resolving Power)
Rationale: Resolution measures image clarity and detail. Increasing magnification without resolution
produces “empty magnification”—a larger but blurrier image.
Question 3. When switching from the low-power (10x) to the high-power (40x) objective lens,
which focusing knob should you use to bring the specimen into sharp focus?
A) Coarse adjustment knob
B) Fine adjustment knob
C) Stage control knob
D) Condenser knob
Correct Answer: B) Fine adjustment knob
Rationale: The coarse adjustment knob should never be used on high power, as it risks crashing the objective
lens into the slide and causing damage.
Question 4. What is the primary purpose of using immersion oil with the 100x (oil immersion)
objective lens?
A) To clean the lens between uses
B) To stain the specimen for better visibility
C) To prevent light from scattering, thereby increasing resolution
D) To keep the slide from drying out
Correct Answer: C) To prevent light from scattering, thereby increasing resolution
Rationale: Immersion oil has the same refractive index as glass, preventing light rays from refracting as they
leave the slide, which maximizes resolution at 100x.
Question 5. If a microscope is “parfocal,” what does this mean for the user?
A) The microscope can only view one type of cell
B) When you change objective lenses, the specimen remains roughly in focus
C) The microscope uses polarized light to view specimens
D) The lenses can magnify up to 10,000x
Correct Answer: B) When you change objective lenses, the specimen remains roughly in focus
Rationale: Parfocal lenses are aligned so only minor fine-focus adjustments are needed when switching
magnifications.
Question 6. “Working distance” refers to:
Page 2
Quiz 1 — Practice Examination
Microscopic Examination of Cell Structure and Genetics Laboratory
25-Question Multiple-Choice Practice Exam
Liberty University
Department of Biology & Health Sciences
June 10, 2026
Instructions
This practice examination contains 25 multiple-choice questions organized into five sections:
Microscopy and Laboratory Techniques (Q1–6), Cell Structure and Organelles (Q7–12), The Cell
Cycle, Mitosis, and Meiosis (Q13–19), DNA Structure (Q20–23), and Christian Worldview
Integration (Q24–25). Each question is followed by the correct answer and a detailed rationale.
Select the single best answer for each question.
, ETHC 210 Quiz 1 Practice Exam
Part 1: Microscopy and Laboratory Techniques (Questions 1–6)
Question 1. If a light microscope has an ocular lens (eyepiece) with a magnification of 10x, and you
are viewing a specimen using the high-dry objective lens (40x), what is the total magnification?
A) 50x
B) 400x
C) 4000x
D) 140x
Correct Answer: B) 400x
Rationale: Total magnification = ocular lens × objective lens. 10 × 40 = 400x.
Question 2. Which term describes the ability of a microscope to distinguish two closely spaced
objects as separate and distinct, rather than just making them look bigger?
A) Magnification
B) Parfocality
C) Resolution (Resolving Power)
D) Working Distance
Correct Answer: C) Resolution (Resolving Power)
Rationale: Resolution measures image clarity and detail. Increasing magnification without resolution
produces “empty magnification”—a larger but blurrier image.
Question 3. When switching from the low-power (10x) to the high-power (40x) objective lens,
which focusing knob should you use to bring the specimen into sharp focus?
A) Coarse adjustment knob
B) Fine adjustment knob
C) Stage control knob
D) Condenser knob
Correct Answer: B) Fine adjustment knob
Rationale: The coarse adjustment knob should never be used on high power, as it risks crashing the objective
lens into the slide and causing damage.
Question 4. What is the primary purpose of using immersion oil with the 100x (oil immersion)
objective lens?
A) To clean the lens between uses
B) To stain the specimen for better visibility
C) To prevent light from scattering, thereby increasing resolution
D) To keep the slide from drying out
Correct Answer: C) To prevent light from scattering, thereby increasing resolution
Rationale: Immersion oil has the same refractive index as glass, preventing light rays from refracting as they
leave the slide, which maximizes resolution at 100x.
Question 5. If a microscope is “parfocal,” what does this mean for the user?
A) The microscope can only view one type of cell
B) When you change objective lenses, the specimen remains roughly in focus
C) The microscope uses polarized light to view specimens
D) The lenses can magnify up to 10,000x
Correct Answer: B) When you change objective lenses, the specimen remains roughly in focus
Rationale: Parfocal lenses are aligned so only minor fine-focus adjustments are needed when switching
magnifications.
Question 6. “Working distance” refers to:
Page 2
