BIOL 1408 Actual Midterm 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 all move from place to place
B. They are composed of one or more cells
C. They all reproduce sexually
D. They all obtain energy from sunlight
Correct Answer: B. They are composed of one or more cells
Rationale: Cell theory states that all living organisms consist of one or
more cells.
2. Which sequence correctly represents levels of biological
organization from simplest to most complex?
A. Tissue → cell → organ → organism
B. Cell → tissue → organ → organ system
C. Organ → tissue → cell → organism
D. Organism → organ system → tissue → cell
Correct Answer: B. Cell → tissue → organ → organ system
Rationale: Cells form tissues, tissues form organs, and organs work
together in organ systems.
3. A hypothesis is best described as:
,A. A proven scientific fact
B. A testable explanation for an observation
C. A scientific law
D. A collection of unrelated observations
Correct Answer: B. A testable explanation for an observation
Rationale: A hypothesis is a proposed explanation that can be tested
experimentally.
4. Which variable is deliberately changed by a researcher?
A. Dependent variable
B. Controlled variable
C. Independent variable
D. Responding variable
Correct Answer: C. Independent variable
Rationale: The independent variable is manipulated to determine its
effect on the dependent variable.
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. Why is a control group useful?
,A. It eliminates all experimental error
B. It provides a comparison with the experimental group
C. It always receives the experimental treatment
D. It guarantees the hypothesis is correct
Correct Answer: B. It provides a comparison with the experimental
group
Rationale: Controls provide a baseline against which experimental
results can be compared.
7. Which statement best describes a scientific theory?
A. An unsupported opinion
B. A guess that has never been tested
C. A well-supported explanation based on extensive evidence
D. A temporary observation
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 polarity
C. Inability to dissolve substances
D. Absence of cohesion
Correct Answer: A. High specific heat
Rationale: Hydrogen bonding allows water to absorb substantial heat
before its temperature changes significantly.
, 9. Water is considered a polar molecule because:
A. Its electrons are shared equally
B. Oxygen and hydrogen have identical electronegativities
C. It has partial positive and negative regions
D. It contains no covalent bonds
Correct Answer: C. It has partial positive and negative regions
Rationale: Oxygen attracts shared electrons more strongly than
hydrogen, producing unequal charge distribution.
10. A solution with a pH of 3 is:
A. Neutral
B. Basic
C. Acidic
D. Nonpolar
Correct Answer: C. Acidic
Rationale: Values below pH 7 are acidic.
11. Which element is especially important in biological molecules?
A. Carbon
B. Neon
C. Helium
D. Argon
Correct Answer: A. Carbon
Rationale: Carbon can form four covalent bonds and serves as the
structural backbone of many biological molecules.
12. Which bond involves the sharing of electrons?
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 all move from place to place
B. They are composed of one or more cells
C. They all reproduce sexually
D. They all obtain energy from sunlight
Correct Answer: B. They are composed of one or more cells
Rationale: Cell theory states that all living organisms consist of one or
more cells.
2. Which sequence correctly represents levels of biological
organization from simplest to most complex?
A. Tissue → cell → organ → organism
B. Cell → tissue → organ → organ system
C. Organ → tissue → cell → organism
D. Organism → organ system → tissue → cell
Correct Answer: B. Cell → tissue → organ → organ system
Rationale: Cells form tissues, tissues form organs, and organs work
together in organ systems.
3. A hypothesis is best described as:
,A. A proven scientific fact
B. A testable explanation for an observation
C. A scientific law
D. A collection of unrelated observations
Correct Answer: B. A testable explanation for an observation
Rationale: A hypothesis is a proposed explanation that can be tested
experimentally.
4. Which variable is deliberately changed by a researcher?
A. Dependent variable
B. Controlled variable
C. Independent variable
D. Responding variable
Correct Answer: C. Independent variable
Rationale: The independent variable is manipulated to determine its
effect on the dependent variable.
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. Why is a control group useful?
,A. It eliminates all experimental error
B. It provides a comparison with the experimental group
C. It always receives the experimental treatment
D. It guarantees the hypothesis is correct
Correct Answer: B. It provides a comparison with the experimental
group
Rationale: Controls provide a baseline against which experimental
results can be compared.
7. Which statement best describes a scientific theory?
A. An unsupported opinion
B. A guess that has never been tested
C. A well-supported explanation based on extensive evidence
D. A temporary observation
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 polarity
C. Inability to dissolve substances
D. Absence of cohesion
Correct Answer: A. High specific heat
Rationale: Hydrogen bonding allows water to absorb substantial heat
before its temperature changes significantly.
, 9. Water is considered a polar molecule because:
A. Its electrons are shared equally
B. Oxygen and hydrogen have identical electronegativities
C. It has partial positive and negative regions
D. It contains no covalent bonds
Correct Answer: C. It has partial positive and negative regions
Rationale: Oxygen attracts shared electrons more strongly than
hydrogen, producing unequal charge distribution.
10. A solution with a pH of 3 is:
A. Neutral
B. Basic
C. Acidic
D. Nonpolar
Correct Answer: C. Acidic
Rationale: Values below pH 7 are acidic.
11. Which element is especially important in biological molecules?
A. Carbon
B. Neon
C. Helium
D. Argon
Correct Answer: A. Carbon
Rationale: Carbon can form four covalent bonds and serves as the
structural backbone of many biological molecules.
12. Which bond involves the sharing of electrons?
