BIO WGU STUDY FOR OA C190 EXAM 300 – COMPREHENSIVE QUESTIONS AND ANSWERS |
VERIFIED AND WELLDETAILED ANSWERS | DETAILED EXPLANATIONS AND RATIONALES |
COMPLETE EXAM PREPARATION STUDY GUIDE | PRACTICE QUESTIONS | LATEST EXAM
UPDATE
• **CORE DOMAINS***
•
1. Scientific Method, Characteristics of Life, and Biological Organization
2. Chemistry of Life, Atoms, Bonds, Water, and Macromolecules
3. Cell Structure, Function, and Cellular Organization
4. Cell Membranes, Transport, Enzymes, and Cellular Energy
5. Photosynthesis, Cellular Respiration, and Metabolism
6. Cell Cycle, Mitosis, Meiosis, and Reproduction
7. DNA, RNA, Gene Expression, and Molecular Genetics
8. Classical and Non-Mendelian Genetics
9. Evolution, Natural Selection, and Biological Diversity
10. Ecology, Ecosystems, Biodiversity, and Environmental Interactions
• **INTRODUCTION***
•
*This comprehensive assessment is designed to strengthen the knowledge and reasoning
skills required for WGU C190 Introduction to Biology. The material emphasizes foundational
biological principles as well as application, interpretation, comparison, and scientific
reasoning. Multiple-choice questions are used to practice identifying biological structures,
explaining processes, interpreting inheritance patterns, analyzing energy flow, and applying
evolutionary and ecological concepts. Effective preparation requires more than memorizing
terminology; learners should understand relationships among biological systems and
recognize how changes at one level can affect another. The questions therefore progress
from foundational concepts to application and higher-level reasoning, providing practice
with examination-style decision-making and conceptual distinctions. WGU describes C190 as
a foundational introduction to biological sciences, including energy, growth, reproduction,
homeostasis, evolution, and interactions with the environment. *
SECTION ONE: QUESTIONS 1–100
QUESTION 1
Question 1. Which statement best describes biology?
A. The study of nonliving chemical substances only
B. The study of living organisms and their interactions with one another and their
environments
,C. The study of Earth's physical structures only
D. The study of astronomical objects and their movements
Correct Answer: B. The study of living organisms and their interactions with one another and
their environments
Explanation: Biology is the scientific study of life. It includes living organisms, their structures
and functions, how they reproduce and evolve, and how they interact with their
environments.
QUESTION 2
Question 2. Which characteristic is shared by all living organisms?
A. They are composed of one or more cells
B. They can move from one location to another
C. They perform photosynthesis
D. They reproduce sexually
Correct Answer: A. They are composed of one or more cells
Explanation: Cell theory establishes that all living organisms are made of one or more cells.
Movement, photosynthesis, and sexual reproduction are not universal characteristics of life.
QUESTION 3
Question 3. Which sequence correctly arranges biological organization from smallest to
largest?
A. Organ → tissue → cell → organ system → organism
B. Molecule → cell → tissue → organ → organ system → organism
C. Cell → molecule → tissue → organism → organ
D. Tissue → molecule → organ → cell → organism
Correct Answer: B. Molecule → cell → tissue → organ → organ system → organism
Explanation: Molecules form cellular structures, cells form tissues, tissues form organs,
organs form organ systems, and organ systems work together within an organism.
QUESTION 4
Question 4. A scientist observes that a particular plant grows more rapidly when exposed to
increased light. Which step of scientific inquiry is represented by this observation?
A. Forming a conclusion
B. Developing a controlled variable
C. Making an observation
D. Rejecting the hypothesis
,Correct Answer: C. Making an observation
Explanation: Scientific investigations often begin with observations. The observation may
then lead to a question and a testable hypothesis.
QUESTION 5
Question 5. Which statement best describes a scientific hypothesis?
A. A proven explanation that can never be changed
B. A testable proposed explanation for an observation
C. A collection of unrelated observations
D. A mathematical measurement
Correct Answer: B. A testable proposed explanation for an observation
Explanation: A hypothesis is a tentative, testable explanation. It must be capable of being
supported or rejected through evidence.
QUESTION 6
Question 6. In an experiment testing whether fertilizer affects plant height, what is the
independent variable?
A. Plant height
B. Amount or type of fertilizer applied
C. Amount of sunlight measured
D. Number of leaves at the end of the experiment
Correct Answer: B. Amount or type of fertilizer applied
Explanation: The independent variable is the factor deliberately changed by the researcher.
Plant height is a dependent variable because it is measured as the response.
QUESTION 7
Question 7. In the fertilizer experiment, which measurement would most directly represent
the dependent variable?
A. Type of fertilizer selected
B. Amount of fertilizer administered
C. Height of the plants after the experiment
D. Species of fertilizer-producing organism
Correct Answer: C. Height of the plants after the experiment
Explanation: The dependent variable is the outcome measured by the investigator. In this
experiment, plant height is measured to determine whether fertilizer produced an effect.
QUESTION 8
, Question 8. Why is a control group useful in an experiment?
A. It guarantees that the hypothesis is correct
B. It provides a comparison against which the experimental treatment can be evaluated
C. It eliminates all biological variation
D. It prevents the independent variable from changing
Correct Answer: B. It provides a comparison against which the experimental treatment can
be evaluated
Explanation: A control group provides a baseline. Comparing it with the experimental group
helps determine whether observed differences are associated with the treatment.
QUESTION 9
Question 9. Which statement distinguishes a scientific theory from a hypothesis?
A. A theory is never supported by evidence
B. A hypothesis is always more comprehensive than a theory
C. A theory is a well-supported explanation based on extensive evidence
D. A theory cannot be modified when new evidence appears
Correct Answer: C. A theory is a well-supported explanation based on extensive evidence
Explanation: Scientific theories are broad explanations supported by substantial evidence
from repeated observations and experiments. They remain open to refinement when
credible new evidence emerges.
QUESTION 10
Question 10. Which level of biological organization includes all ecosystems on Earth?
A. Community
B. Biome
C. Biosphere
D. Population
Correct Answer: C. Biosphere
Explanation: The biosphere encompasses all regions of Earth where life exists, including all
ecosystems.
QUESTION 11
Question 11. An atom contains 11 protons, 11 electrons, and 12 neutrons. What is its atomic
number?
A. 11
B. 12
VERIFIED AND WELLDETAILED ANSWERS | DETAILED EXPLANATIONS AND RATIONALES |
COMPLETE EXAM PREPARATION STUDY GUIDE | PRACTICE QUESTIONS | LATEST EXAM
UPDATE
• **CORE DOMAINS***
•
1. Scientific Method, Characteristics of Life, and Biological Organization
2. Chemistry of Life, Atoms, Bonds, Water, and Macromolecules
3. Cell Structure, Function, and Cellular Organization
4. Cell Membranes, Transport, Enzymes, and Cellular Energy
5. Photosynthesis, Cellular Respiration, and Metabolism
6. Cell Cycle, Mitosis, Meiosis, and Reproduction
7. DNA, RNA, Gene Expression, and Molecular Genetics
8. Classical and Non-Mendelian Genetics
9. Evolution, Natural Selection, and Biological Diversity
10. Ecology, Ecosystems, Biodiversity, and Environmental Interactions
• **INTRODUCTION***
•
*This comprehensive assessment is designed to strengthen the knowledge and reasoning
skills required for WGU C190 Introduction to Biology. The material emphasizes foundational
biological principles as well as application, interpretation, comparison, and scientific
reasoning. Multiple-choice questions are used to practice identifying biological structures,
explaining processes, interpreting inheritance patterns, analyzing energy flow, and applying
evolutionary and ecological concepts. Effective preparation requires more than memorizing
terminology; learners should understand relationships among biological systems and
recognize how changes at one level can affect another. The questions therefore progress
from foundational concepts to application and higher-level reasoning, providing practice
with examination-style decision-making and conceptual distinctions. WGU describes C190 as
a foundational introduction to biological sciences, including energy, growth, reproduction,
homeostasis, evolution, and interactions with the environment. *
SECTION ONE: QUESTIONS 1–100
QUESTION 1
Question 1. Which statement best describes biology?
A. The study of nonliving chemical substances only
B. The study of living organisms and their interactions with one another and their
environments
,C. The study of Earth's physical structures only
D. The study of astronomical objects and their movements
Correct Answer: B. The study of living organisms and their interactions with one another and
their environments
Explanation: Biology is the scientific study of life. It includes living organisms, their structures
and functions, how they reproduce and evolve, and how they interact with their
environments.
QUESTION 2
Question 2. Which characteristic is shared by all living organisms?
A. They are composed of one or more cells
B. They can move from one location to another
C. They perform photosynthesis
D. They reproduce sexually
Correct Answer: A. They are composed of one or more cells
Explanation: Cell theory establishes that all living organisms are made of one or more cells.
Movement, photosynthesis, and sexual reproduction are not universal characteristics of life.
QUESTION 3
Question 3. Which sequence correctly arranges biological organization from smallest to
largest?
A. Organ → tissue → cell → organ system → organism
B. Molecule → cell → tissue → organ → organ system → organism
C. Cell → molecule → tissue → organism → organ
D. Tissue → molecule → organ → cell → organism
Correct Answer: B. Molecule → cell → tissue → organ → organ system → organism
Explanation: Molecules form cellular structures, cells form tissues, tissues form organs,
organs form organ systems, and organ systems work together within an organism.
QUESTION 4
Question 4. A scientist observes that a particular plant grows more rapidly when exposed to
increased light. Which step of scientific inquiry is represented by this observation?
A. Forming a conclusion
B. Developing a controlled variable
C. Making an observation
D. Rejecting the hypothesis
,Correct Answer: C. Making an observation
Explanation: Scientific investigations often begin with observations. The observation may
then lead to a question and a testable hypothesis.
QUESTION 5
Question 5. Which statement best describes a scientific hypothesis?
A. A proven explanation that can never be changed
B. A testable proposed explanation for an observation
C. A collection of unrelated observations
D. A mathematical measurement
Correct Answer: B. A testable proposed explanation for an observation
Explanation: A hypothesis is a tentative, testable explanation. It must be capable of being
supported or rejected through evidence.
QUESTION 6
Question 6. In an experiment testing whether fertilizer affects plant height, what is the
independent variable?
A. Plant height
B. Amount or type of fertilizer applied
C. Amount of sunlight measured
D. Number of leaves at the end of the experiment
Correct Answer: B. Amount or type of fertilizer applied
Explanation: The independent variable is the factor deliberately changed by the researcher.
Plant height is a dependent variable because it is measured as the response.
QUESTION 7
Question 7. In the fertilizer experiment, which measurement would most directly represent
the dependent variable?
A. Type of fertilizer selected
B. Amount of fertilizer administered
C. Height of the plants after the experiment
D. Species of fertilizer-producing organism
Correct Answer: C. Height of the plants after the experiment
Explanation: The dependent variable is the outcome measured by the investigator. In this
experiment, plant height is measured to determine whether fertilizer produced an effect.
QUESTION 8
, Question 8. Why is a control group useful in an experiment?
A. It guarantees that the hypothesis is correct
B. It provides a comparison against which the experimental treatment can be evaluated
C. It eliminates all biological variation
D. It prevents the independent variable from changing
Correct Answer: B. It provides a comparison against which the experimental treatment can
be evaluated
Explanation: A control group provides a baseline. Comparing it with the experimental group
helps determine whether observed differences are associated with the treatment.
QUESTION 9
Question 9. Which statement distinguishes a scientific theory from a hypothesis?
A. A theory is never supported by evidence
B. A hypothesis is always more comprehensive than a theory
C. A theory is a well-supported explanation based on extensive evidence
D. A theory cannot be modified when new evidence appears
Correct Answer: C. A theory is a well-supported explanation based on extensive evidence
Explanation: Scientific theories are broad explanations supported by substantial evidence
from repeated observations and experiments. They remain open to refinement when
credible new evidence emerges.
QUESTION 10
Question 10. Which level of biological organization includes all ecosystems on Earth?
A. Community
B. Biome
C. Biosphere
D. Population
Correct Answer: C. Biosphere
Explanation: The biosphere encompasses all regions of Earth where life exists, including all
ecosystems.
QUESTION 11
Question 11. An atom contains 11 protons, 11 electrons, and 12 neutrons. What is its atomic
number?
A. 11
B. 12
