WGU C190 INTRO TO BIOLOGY FINAL AND PRE-ASSESSMENT EXAM –
QUESTIONS AND ANSWERS | VERIFIED AND WELL DETAILED ANSWERS | PLUS
RATIONALES | DOWNLOAD AND PASS | LATEST EXAM UPDATE 2026/2027
Core Domains
Cell Biology and Membrane Dynamics
Metabolism, Enzymes, and Cellular Respiration
Molecular Genetics and Gene Expression
Mendelian and Population Genetics
Evolution and Natural Selection
Ecology, Ecosystems, and Biodiversity
Plant and Animal Physiology
Human Anatomy and Homeostasis
Introduction
This comprehensive examination is designed to assess your mastery of fundamental
biological principles as outlined in the WGU C190 curriculum. It evaluates your
understanding of key concepts, from the molecular machinery of the cell to the
complex interactions within ecosystems. You will be presented with a variety of
multiple-choice and scenario-based questions that require not only recall of
information but also the application of knowledge to novel situations. The questions
emphasize real-world problem-solving and critical decision-making, challenging
you to synthesize information across different biological domains to demonstrate
exam readiness.
Section One: Questions 1-50
,1. Which of the following best describes the relationship between an atom's
atomic number and its identity?
A. The atomic number is the total number of protons and neutrons in the nucleus.
B. The atomic number determines the atom's reactivity with other elements.
C. The atomic number defines the number of electrons in the outermost shell.
D. The atomic number is the number of protons, which uniquely identifies the
element.
🟢 Correct Answer: D. The atomic number is the number of protons, which
uniquely identifies the element.
🔴 Explanation: The atomic number is the definitive characteristic of an element,
equal to the number of protons in its nucleus. This number cannot change
without changing the element itself. Options A, B, and C describe other properties
that are not the defining feature of an element's identity.
2. In a plant cell, which organelle is primarily responsible for converting light
energy into chemical energy stored in glucose?
A. Mitochondrion
B. Chloroplast
C. Ribosome
D. Nucleus
🟢 Correct Answer: B. Chloroplast
🔴 Explanation: Chloroplasts are the sites of photosynthesis, where light energy is
captured and used to synthesize glucose from carbon dioxide and water.
Mitochondria (A) are responsible for cellular respiration. Ribosomes (C) synthesize
proteins. The nucleus (D) houses genetic material.
3. A scientist observes a cell under a microscope and notes the presence of a
cell wall, a large central vacuole, and chloroplasts. This cell is most likely from:
,A. An animal
B. A bacterium
C. A fungus
D. A plant
🟢 Correct Answer: D. A plant
🔴 Explanation: The combination of a rigid cell wall, a large central vacuole for
storage and turgor pressure, and chloroplasts for photosynthesis is a defining
characteristic of plant cells. Animal cells (A) lack cell walls and chloroplasts.
Bacterial cells (B) have cell walls but do not have membrane-bound organelles
like chloroplasts or a central vacuole. Fungal cells (C) have cell walls made of
chitin but lack chloroplasts.
4. Which of the following is a key function of the smooth endoplasmic
reticulum?
A. Protein synthesis and modification
B. Lipid synthesis and detoxification
C. ATP production via cellular respiration
D. Packaging and sorting proteins for secretion
🟢 Correct Answer: B. Lipid synthesis and detoxification
🔴 Explanation: The smooth ER is involved in the synthesis of lipids,
phospholipids, and steroids, as well as the detoxification of drugs and poisons.
Protein synthesis and modification (A) are functions of the rough ER. ATP
production (C) is a function of the mitochondria. Packaging and sorting proteins
(D) is a function of the Golgi apparatus.
5. A patient presents with a genetic disorder characterized by the inability to
properly digest fats. This is most likely a defect in which cellular organelle?
, A. Nucleus
B. Lysosome
C. Peroxisome
D. Ribosome
🟢 Correct Answer: B. Lysosome
🔴 Explanation: Lysosomes contain hydrolytic enzymes essential for the
intracellular digestion of macromolecules, including fats. A defect in a lysosomal
enzyme could lead to the accumulation of undigested fats. While peroxisomes (C)
are involved in lipid metabolism, lysosomes are the primary site for the
breakdown of a wide range of biomolecules.
6. What is the fundamental purpose of cellular respiration?
A. To produce glucose from carbon dioxide and water.
B. To convert light energy into chemical energy.
C. To break down glucose to produce ATP.
D. To synthesize proteins from amino acids.
🟢 Correct Answer: C. To break down glucose to produce ATP.
🔴 Explanation: Cellular respiration is a catabolic process that breaks down
glucose and other organic molecules to generate ATP, the main energy currency
of the cell. Option A describes photosynthesis. Option B describes the initial step
of photosynthesis. Option D describes translation (protein synthesis).
7. In glycolysis, one molecule of glucose is broken down into two molecules of:
A. Acetyl-CoA
B. Pyruvate
C. Citrate
D. NADH
QUESTIONS AND ANSWERS | VERIFIED AND WELL DETAILED ANSWERS | PLUS
RATIONALES | DOWNLOAD AND PASS | LATEST EXAM UPDATE 2026/2027
Core Domains
Cell Biology and Membrane Dynamics
Metabolism, Enzymes, and Cellular Respiration
Molecular Genetics and Gene Expression
Mendelian and Population Genetics
Evolution and Natural Selection
Ecology, Ecosystems, and Biodiversity
Plant and Animal Physiology
Human Anatomy and Homeostasis
Introduction
This comprehensive examination is designed to assess your mastery of fundamental
biological principles as outlined in the WGU C190 curriculum. It evaluates your
understanding of key concepts, from the molecular machinery of the cell to the
complex interactions within ecosystems. You will be presented with a variety of
multiple-choice and scenario-based questions that require not only recall of
information but also the application of knowledge to novel situations. The questions
emphasize real-world problem-solving and critical decision-making, challenging
you to synthesize information across different biological domains to demonstrate
exam readiness.
Section One: Questions 1-50
,1. Which of the following best describes the relationship between an atom's
atomic number and its identity?
A. The atomic number is the total number of protons and neutrons in the nucleus.
B. The atomic number determines the atom's reactivity with other elements.
C. The atomic number defines the number of electrons in the outermost shell.
D. The atomic number is the number of protons, which uniquely identifies the
element.
🟢 Correct Answer: D. The atomic number is the number of protons, which
uniquely identifies the element.
🔴 Explanation: The atomic number is the definitive characteristic of an element,
equal to the number of protons in its nucleus. This number cannot change
without changing the element itself. Options A, B, and C describe other properties
that are not the defining feature of an element's identity.
2. In a plant cell, which organelle is primarily responsible for converting light
energy into chemical energy stored in glucose?
A. Mitochondrion
B. Chloroplast
C. Ribosome
D. Nucleus
🟢 Correct Answer: B. Chloroplast
🔴 Explanation: Chloroplasts are the sites of photosynthesis, where light energy is
captured and used to synthesize glucose from carbon dioxide and water.
Mitochondria (A) are responsible for cellular respiration. Ribosomes (C) synthesize
proteins. The nucleus (D) houses genetic material.
3. A scientist observes a cell under a microscope and notes the presence of a
cell wall, a large central vacuole, and chloroplasts. This cell is most likely from:
,A. An animal
B. A bacterium
C. A fungus
D. A plant
🟢 Correct Answer: D. A plant
🔴 Explanation: The combination of a rigid cell wall, a large central vacuole for
storage and turgor pressure, and chloroplasts for photosynthesis is a defining
characteristic of plant cells. Animal cells (A) lack cell walls and chloroplasts.
Bacterial cells (B) have cell walls but do not have membrane-bound organelles
like chloroplasts or a central vacuole. Fungal cells (C) have cell walls made of
chitin but lack chloroplasts.
4. Which of the following is a key function of the smooth endoplasmic
reticulum?
A. Protein synthesis and modification
B. Lipid synthesis and detoxification
C. ATP production via cellular respiration
D. Packaging and sorting proteins for secretion
🟢 Correct Answer: B. Lipid synthesis and detoxification
🔴 Explanation: The smooth ER is involved in the synthesis of lipids,
phospholipids, and steroids, as well as the detoxification of drugs and poisons.
Protein synthesis and modification (A) are functions of the rough ER. ATP
production (C) is a function of the mitochondria. Packaging and sorting proteins
(D) is a function of the Golgi apparatus.
5. A patient presents with a genetic disorder characterized by the inability to
properly digest fats. This is most likely a defect in which cellular organelle?
, A. Nucleus
B. Lysosome
C. Peroxisome
D. Ribosome
🟢 Correct Answer: B. Lysosome
🔴 Explanation: Lysosomes contain hydrolytic enzymes essential for the
intracellular digestion of macromolecules, including fats. A defect in a lysosomal
enzyme could lead to the accumulation of undigested fats. While peroxisomes (C)
are involved in lipid metabolism, lysosomes are the primary site for the
breakdown of a wide range of biomolecules.
6. What is the fundamental purpose of cellular respiration?
A. To produce glucose from carbon dioxide and water.
B. To convert light energy into chemical energy.
C. To break down glucose to produce ATP.
D. To synthesize proteins from amino acids.
🟢 Correct Answer: C. To break down glucose to produce ATP.
🔴 Explanation: Cellular respiration is a catabolic process that breaks down
glucose and other organic molecules to generate ATP, the main energy currency
of the cell. Option A describes photosynthesis. Option B describes the initial step
of photosynthesis. Option D describes translation (protein synthesis).
7. In glycolysis, one molecule of glucose is broken down into two molecules of:
A. Acetyl-CoA
B. Pyruvate
C. Citrate
D. NADH
