BIOL 1408 Actual Final Exam | Biology for Non-Science Majors
I | 2026/2027 Complete Practice Questions, Correct Answers
& Detailed Rationales
Section I — Scientific Method, Chemistry & Biological Foundations
1. Which characteristic is shared by all living organisms?
A. They produce oxygen
B. They are composed of one or more cells
C. They reproduce sexually
D. They obtain energy from sunlight
Correct Answer: B. They are composed of one or more cells
Rationale: Cell theory states that all living organisms are composed of
one or more cells.
2. Which level of organization is directly above the cellular level?
A. Tissue
B. Organ
C. Organ system
D. Organism
Correct Answer: A. Tissue
Rationale: Similar cells organized to perform a common function form
tissues.
3. A proposed explanation that can be tested experimentally is called
a:
,A. Theory
B. Hypothesis
C. Law
D. Variable
Correct Answer: B. Hypothesis
Rationale: A hypothesis is a testable, tentative explanation for an
observation.
4. Which variable is deliberately changed by a researcher?
A. Dependent variable
B. Controlled variable
C. Independent variable
D. Response variable
Correct Answer: C. Independent variable
Rationale: The independent variable is manipulated to determine its
effect.
5. Which variable is measured in an experiment?
A. Independent variable
B. Dependent variable
C. Control variable
D. Constant
Correct Answer: B. Dependent variable
Rationale: The dependent variable is the measured response to the
independent variable.
6. What is the primary purpose of a control group?
,A. To increase the sample size only
B. To provide a comparison with the experimental treatment
C. To eliminate all variables
D. To guarantee the hypothesis is correct
Correct Answer: B. To provide a comparison with the experimental
treatment
Rationale: A control establishes a baseline against which experimental
results can be compared.
7. Which statement represents a scientific theory?
A. An unsupported opinion
B. A random guess
C. A well-supported explanation based on extensive evidence
D. A statement that cannot be tested
Correct Answer: C. A well-supported explanation based on extensive
evidence
Rationale: Scientific theories are strongly supported explanations that
integrate substantial evidence.
8. Which property of water results from hydrogen bonding?
A. High specific heat
B. Lack of cohesion
C. Inability to dissolve polar substances
D. Nonpolarity
Correct Answer: A. High specific heat
Rationale: Hydrogen bonding allows water to absorb substantial heat
with relatively little temperature change.
, 9. A substance with a pH of 3 is:
A. Neutral
B. Basic
C. Acidic
D. Nonpolar
Correct Answer: C. Acidic
Rationale: Values below 7 indicate acidity.
10. Which element is central to the structure of organic molecules?
A. Carbon
B. Sodium
C. Chlorine
D. Iron
Correct Answer: A. Carbon
Rationale: Carbon forms four covalent bonds and provides the
structural backbone of organic molecules.
11. Which macromolecule includes enzymes?
A. Carbohydrates
B. Lipids
C. Proteins
D. Nucleic acids
Correct Answer: C. Proteins
Rationale: Most biological enzymes are proteins that catalyze chemical
reactions.
12. The monomers of proteins are:
I | 2026/2027 Complete Practice Questions, Correct Answers
& Detailed Rationales
Section I — Scientific Method, Chemistry & Biological Foundations
1. Which characteristic is shared by all living organisms?
A. They produce oxygen
B. They are composed of one or more cells
C. They reproduce sexually
D. They obtain energy from sunlight
Correct Answer: B. They are composed of one or more cells
Rationale: Cell theory states that all living organisms are composed of
one or more cells.
2. Which level of organization is directly above the cellular level?
A. Tissue
B. Organ
C. Organ system
D. Organism
Correct Answer: A. Tissue
Rationale: Similar cells organized to perform a common function form
tissues.
3. A proposed explanation that can be tested experimentally is called
a:
,A. Theory
B. Hypothesis
C. Law
D. Variable
Correct Answer: B. Hypothesis
Rationale: A hypothesis is a testable, tentative explanation for an
observation.
4. Which variable is deliberately changed by a researcher?
A. Dependent variable
B. Controlled variable
C. Independent variable
D. Response variable
Correct Answer: C. Independent variable
Rationale: The independent variable is manipulated to determine its
effect.
5. Which variable is measured in an experiment?
A. Independent variable
B. Dependent variable
C. Control variable
D. Constant
Correct Answer: B. Dependent variable
Rationale: The dependent variable is the measured response to the
independent variable.
6. What is the primary purpose of a control group?
,A. To increase the sample size only
B. To provide a comparison with the experimental treatment
C. To eliminate all variables
D. To guarantee the hypothesis is correct
Correct Answer: B. To provide a comparison with the experimental
treatment
Rationale: A control establishes a baseline against which experimental
results can be compared.
7. Which statement represents a scientific theory?
A. An unsupported opinion
B. A random guess
C. A well-supported explanation based on extensive evidence
D. A statement that cannot be tested
Correct Answer: C. A well-supported explanation based on extensive
evidence
Rationale: Scientific theories are strongly supported explanations that
integrate substantial evidence.
8. Which property of water results from hydrogen bonding?
A. High specific heat
B. Lack of cohesion
C. Inability to dissolve polar substances
D. Nonpolarity
Correct Answer: A. High specific heat
Rationale: Hydrogen bonding allows water to absorb substantial heat
with relatively little temperature change.
, 9. A substance with a pH of 3 is:
A. Neutral
B. Basic
C. Acidic
D. Nonpolar
Correct Answer: C. Acidic
Rationale: Values below 7 indicate acidity.
10. Which element is central to the structure of organic molecules?
A. Carbon
B. Sodium
C. Chlorine
D. Iron
Correct Answer: A. Carbon
Rationale: Carbon forms four covalent bonds and provides the
structural backbone of organic molecules.
11. Which macromolecule includes enzymes?
A. Carbohydrates
B. Lipids
C. Proteins
D. Nucleic acids
Correct Answer: C. Proteins
Rationale: Most biological enzymes are proteins that catalyze chemical
reactions.
12. The monomers of proteins are:
