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BIOL180 – UNIT TEST 1: SCIENTIFIC METHOD AND CELL
BASICS – PRACTICE EXAM 2026/2027 COMPLETE
CURRENT TESTING QUESTIONS AND CORRECT
ANSWERS WITH DETAILED RATIONALES.
BIOL
Prepare for the BIOL180 Unit Test 1 – Scientific Method and Cell Basics Exam with this
focused practice resource designed to reinforce foundational biology concepts. Use it
to review the scientific method, experimental design, basic cell concepts, scientific
reasoning, and introductory principles of biology. This resource can help strengthen
your understanding, identify areas that may require additional study, and improve your
test readiness. It provides a structured supplement to your coursework and supports a
more confident approach to the BIOL180 assessment.
MULTIPLE CHOICE.
Section 1: Scientific Method (Q1–Q30)
1. What is the first step in the scientific method?
A. Forming a hypothesis
B. Making observations and asking a question
C. Conducting an experiment
D. Drawing a conclusion
Answer: B
Rationale: Scientific inquiry typically begins with observation and a
question about the natural world.
2. A testable explanation for an observation is called a:
A. Theory
B. Law
C. Hypothesis
D. Conclusion
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Answer: C
Rationale: A hypothesis is a proposed, testable explanation that can be
supported or rejected by evidence.
3. A prediction is often written in which format?
A. If…then…
B. Always…never…
C. Because…therefore…
D. First…last…
Answer: A
Rationale: Predictions often use “if…then…” to link a proposed
explanation to expected observations.
4. The variable that a scientist deliberately changes is the:
A. Dependent variable
B. Independent variable
C. Control variable
D. Standardized variable
Answer: B
Rationale: The independent variable is manipulated by the researcher.
5. The variable that is measured or observed in an experiment is the:
A. Independent variable
B. Dependent variable
C. Control variable
D. Placebo
Answer: B
Rationale: The dependent variable responds to changes in the
independent variable.
6. A control group is used to:
A. Receive the experimental treatment
B. Provide a baseline for comparison
C. Increase the sample size
D. Eliminate all variables
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Answer: B
Rationale: The control group does not receive the experimental treatment
and provides a baseline for comparison.
7. The experimental group is the group that:
A. Does not receive the treatment
B. Receives the treatment or condition being tested
C. Is always the largest group
D. Is not observed
Answer: B
Rationale: The experimental group is exposed to the independent variable
being tested.
8. Variables kept constant across all groups are called:
A. Independent variables
B. Dependent variables
C. Standardized variables
D. Confounding variables
Answer: C
Rationale: Standardized variables are held constant to prevent them from
affecting the results.
9. A placebo is:
A. An active treatment
B. An inactive substance or treatment
C. A type of control variable
D. A statistical test
Answer: B
Rationale: A placebo is an inactive treatment used as a control in clinical
trials.
10. In a blind experiment:
A. The researcher knows the treatment but subjects do not
B. Subjects do not know which treatment they receive
C. Neither subjects nor researchers know treatments
D. No one is observed
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Answer: B
Rationale: In a blind experiment, subjects are unaware of which
treatment they receive.
11. In a double-blind experiment:
A. Only subjects are unaware
B. Only researchers are unaware
C. Neither subjects nor researchers know who receives which treatment
D. Everyone knows the treatment
Answer: C
Rationale: Double-blind studies reduce bias by keeping both subjects and
researchers unaware of treatment assignments.
12. Peer review is important because it:
A. Guarantees a study is correct
B. Allows experts to evaluate scientific work before publication
C. Replaces the need for experiments
D. Proves a hypothesis
Answer: B
Rationale: Peer review allows qualified experts to evaluate methods,
data, and conclusions before publication.
13. A well-supported explanation that has withstood extensive testing is
a:
A. Hypothesis
B. Theory
C. Prediction
D. Guess
Answer: B
Rationale: A scientific theory is a broad, well-supported explanation
based on extensive evidence.
14. A scientific law:
A. Explains why something happens
B. Describes a consistent pattern in nature
BIOL180 – UNIT TEST 1: SCIENTIFIC METHOD AND CELL
BASICS – PRACTICE EXAM 2026/2027 COMPLETE
CURRENT TESTING QUESTIONS AND CORRECT
ANSWERS WITH DETAILED RATIONALES.
BIOL
Prepare for the BIOL180 Unit Test 1 – Scientific Method and Cell Basics Exam with this
focused practice resource designed to reinforce foundational biology concepts. Use it
to review the scientific method, experimental design, basic cell concepts, scientific
reasoning, and introductory principles of biology. This resource can help strengthen
your understanding, identify areas that may require additional study, and improve your
test readiness. It provides a structured supplement to your coursework and supports a
more confident approach to the BIOL180 assessment.
MULTIPLE CHOICE.
Section 1: Scientific Method (Q1–Q30)
1. What is the first step in the scientific method?
A. Forming a hypothesis
B. Making observations and asking a question
C. Conducting an experiment
D. Drawing a conclusion
Answer: B
Rationale: Scientific inquiry typically begins with observation and a
question about the natural world.
2. A testable explanation for an observation is called a:
A. Theory
B. Law
C. Hypothesis
D. Conclusion
, Page 2 of 32
Answer: C
Rationale: A hypothesis is a proposed, testable explanation that can be
supported or rejected by evidence.
3. A prediction is often written in which format?
A. If…then…
B. Always…never…
C. Because…therefore…
D. First…last…
Answer: A
Rationale: Predictions often use “if…then…” to link a proposed
explanation to expected observations.
4. The variable that a scientist deliberately changes is the:
A. Dependent variable
B. Independent variable
C. Control variable
D. Standardized variable
Answer: B
Rationale: The independent variable is manipulated by the researcher.
5. The variable that is measured or observed in an experiment is the:
A. Independent variable
B. Dependent variable
C. Control variable
D. Placebo
Answer: B
Rationale: The dependent variable responds to changes in the
independent variable.
6. A control group is used to:
A. Receive the experimental treatment
B. Provide a baseline for comparison
C. Increase the sample size
D. Eliminate all variables
, Page 3 of 32
Answer: B
Rationale: The control group does not receive the experimental treatment
and provides a baseline for comparison.
7. The experimental group is the group that:
A. Does not receive the treatment
B. Receives the treatment or condition being tested
C. Is always the largest group
D. Is not observed
Answer: B
Rationale: The experimental group is exposed to the independent variable
being tested.
8. Variables kept constant across all groups are called:
A. Independent variables
B. Dependent variables
C. Standardized variables
D. Confounding variables
Answer: C
Rationale: Standardized variables are held constant to prevent them from
affecting the results.
9. A placebo is:
A. An active treatment
B. An inactive substance or treatment
C. A type of control variable
D. A statistical test
Answer: B
Rationale: A placebo is an inactive treatment used as a control in clinical
trials.
10. In a blind experiment:
A. The researcher knows the treatment but subjects do not
B. Subjects do not know which treatment they receive
C. Neither subjects nor researchers know treatments
D. No one is observed
, Page 4 of 32
Answer: B
Rationale: In a blind experiment, subjects are unaware of which
treatment they receive.
11. In a double-blind experiment:
A. Only subjects are unaware
B. Only researchers are unaware
C. Neither subjects nor researchers know who receives which treatment
D. Everyone knows the treatment
Answer: C
Rationale: Double-blind studies reduce bias by keeping both subjects and
researchers unaware of treatment assignments.
12. Peer review is important because it:
A. Guarantees a study is correct
B. Allows experts to evaluate scientific work before publication
C. Replaces the need for experiments
D. Proves a hypothesis
Answer: B
Rationale: Peer review allows qualified experts to evaluate methods,
data, and conclusions before publication.
13. A well-supported explanation that has withstood extensive testing is
a:
A. Hypothesis
B. Theory
C. Prediction
D. Guess
Answer: B
Rationale: A scientific theory is a broad, well-supported explanation
based on extensive evidence.
14. A scientific law:
A. Explains why something happens
B. Describes a consistent pattern in nature
