WGU C190 BIOLOGY COMPREHENSIVE
TEST 2026/2027 QUESTIONS AND
ANSWERS
1. Which component of the scientific method involves a tentative explanation that can be
tested through experimentation?
A. Theory
B. Observation
C. Law
D. Hypothesis
Answer: D
Conceptual Explanation: A hypothesis is a testable, tentative explanation for a
phenomenon. A theory is a well-substantiated explanation, while a law describes universal
observations.
2. What type of chemical bond involves the unequal sharing of electrons between atoms,
resulting in partial charges?
A. Polar covalent bond
,B. Nonpolar covalent bond
C. Ionic bond
D. Hydrogen bond
Answer: A
Conceptual Explanation: Polar covalent bonds occur when electrons are shared unequally
due to differences in electronegativity, creating dipole moments.
3. Which property of water allows it to resist temperature changes, helping organisms
maintain homeostasis?
A. High specific heat
B. Low density as a solid
C. Cohesion
D. Adhesion
Answer: A
Conceptual Explanation: High specific heat means water requires a significant amount of
energy to change its temperature, providing thermal stability.
4. A solution with a pH of 3 is how many times more acidic than a solution with a pH of 6?
A. 2 times
B. 30 times
, C. 1000 times
D. 100 times
Answer: C
Conceptual Explanation: The pH scale is logarithmic. Each whole unit change represents a
ten-fold change in H+ concentration. (10^3 = 1000).
5. Which macromolecule is primarily responsible for long-term energy storage and insulating
organs?
A. Lipids
B. Proteins
C. Carbohydrates
D. Nucleic acids
Answer: A
Conceptual Explanation: Lipids (fats) provide high-density energy storage and serve as
structural components of membranes and insulation.
6. Which level of protein structure is characterized by the sequence of amino acids linked by
peptide bonds?
A. Primary
B. Secondary
C. Tertiary
TEST 2026/2027 QUESTIONS AND
ANSWERS
1. Which component of the scientific method involves a tentative explanation that can be
tested through experimentation?
A. Theory
B. Observation
C. Law
D. Hypothesis
Answer: D
Conceptual Explanation: A hypothesis is a testable, tentative explanation for a
phenomenon. A theory is a well-substantiated explanation, while a law describes universal
observations.
2. What type of chemical bond involves the unequal sharing of electrons between atoms,
resulting in partial charges?
A. Polar covalent bond
,B. Nonpolar covalent bond
C. Ionic bond
D. Hydrogen bond
Answer: A
Conceptual Explanation: Polar covalent bonds occur when electrons are shared unequally
due to differences in electronegativity, creating dipole moments.
3. Which property of water allows it to resist temperature changes, helping organisms
maintain homeostasis?
A. High specific heat
B. Low density as a solid
C. Cohesion
D. Adhesion
Answer: A
Conceptual Explanation: High specific heat means water requires a significant amount of
energy to change its temperature, providing thermal stability.
4. A solution with a pH of 3 is how many times more acidic than a solution with a pH of 6?
A. 2 times
B. 30 times
, C. 1000 times
D. 100 times
Answer: C
Conceptual Explanation: The pH scale is logarithmic. Each whole unit change represents a
ten-fold change in H+ concentration. (10^3 = 1000).
5. Which macromolecule is primarily responsible for long-term energy storage and insulating
organs?
A. Lipids
B. Proteins
C. Carbohydrates
D. Nucleic acids
Answer: A
Conceptual Explanation: Lipids (fats) provide high-density energy storage and serve as
structural components of membranes and insulation.
6. Which level of protein structure is characterized by the sequence of amino acids linked by
peptide bonds?
A. Primary
B. Secondary
C. Tertiary
