1|Page
BIO 103 Exam 1 Actual Questions and Verified
Answers 2026/2027 with Complete Solutions and
Detailed Rationales Grade A
1. According to cell theory, which of the following statements are true? Select all that
apply.
A. All organisms are made up of one or more cells
B. Cells can arise spontaneously from nonliving matter
C. All cells come from other cells
D. Cells are the basic unit of life
Correct Answer: A, C, D
Rationale: Cell theory states that all organisms are made of one or more cells, all cells
come from pre-existing cells, and cells are the basic unit of life. Spontaneous generation
is not supported by cell theory.
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2. A scientist observes that plant leaves are green and proposes, "Leaves reflect green
light more than other wavelengths of light." This statement is an example of:
A. A fact
B. A theory
C. A law
D. A hypothesis
Correct Answer: D. A hypothesis
Rationale: A hypothesis is an educated guess about the reason for a phenomenon that
can be tested. This statement proposes a testable explanation for why leaves appear
green.
3. A scientist states, "Chlorophyll absorbs blue and red wavelengths of light to
perform photosynthesis, and green wavelengths are reflected, causing leaves to
appear green." This statement is an example of:
A. A fact
B. A theory
C. A law
D. A hypothesis
Correct Answer: B. A theory
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Rationale: A theory is a broad explanation of natural phenomena based on many
observations. This statement provides a comprehensive explanation supported by
substantial evidence.
4. The observation that "leaves of plants are green" is an example of:
A. A fact
B. A theory
C. A law
D. A hypothesis
Correct Answer: A. A fact
Rationale: A fact is an observation of a phenomenon in nature. The statement that
leaves are green is a direct observation.
5. A scientist proposes that "chlorophyll activity is directly proportional to the
intensity of red and blue wavelengths of light absorbed and inversely proportional to
the intensity of green wavelengths of light absorbed." This statement is an example
of:
A. A fact
B. A theory
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C. A law
D. A hypothesis
Correct Answer: C. A law
Rationale: A law is a general statement about natural phenomena based on
observations that describes how variables are related. This statement describes a
consistent relationship between variables.
6. Place the steps of the scientific method in the correct order.
A. Analyze results
B. Observe a phenomenon
C. Develop a hypothesis
D. Design an experiment
E. Ask a question
F. Interpret results
G. Implement experiment and collect data
H. Make predictions
Correct Answer: B, E, C, H, D, G, A, F
BIO 103 Exam 1 Actual Questions and Verified
Answers 2026/2027 with Complete Solutions and
Detailed Rationales Grade A
1. According to cell theory, which of the following statements are true? Select all that
apply.
A. All organisms are made up of one or more cells
B. Cells can arise spontaneously from nonliving matter
C. All cells come from other cells
D. Cells are the basic unit of life
Correct Answer: A, C, D
Rationale: Cell theory states that all organisms are made of one or more cells, all cells
come from pre-existing cells, and cells are the basic unit of life. Spontaneous generation
is not supported by cell theory.
,2|Page
2. A scientist observes that plant leaves are green and proposes, "Leaves reflect green
light more than other wavelengths of light." This statement is an example of:
A. A fact
B. A theory
C. A law
D. A hypothesis
Correct Answer: D. A hypothesis
Rationale: A hypothesis is an educated guess about the reason for a phenomenon that
can be tested. This statement proposes a testable explanation for why leaves appear
green.
3. A scientist states, "Chlorophyll absorbs blue and red wavelengths of light to
perform photosynthesis, and green wavelengths are reflected, causing leaves to
appear green." This statement is an example of:
A. A fact
B. A theory
C. A law
D. A hypothesis
Correct Answer: B. A theory
,3|Page
Rationale: A theory is a broad explanation of natural phenomena based on many
observations. This statement provides a comprehensive explanation supported by
substantial evidence.
4. The observation that "leaves of plants are green" is an example of:
A. A fact
B. A theory
C. A law
D. A hypothesis
Correct Answer: A. A fact
Rationale: A fact is an observation of a phenomenon in nature. The statement that
leaves are green is a direct observation.
5. A scientist proposes that "chlorophyll activity is directly proportional to the
intensity of red and blue wavelengths of light absorbed and inversely proportional to
the intensity of green wavelengths of light absorbed." This statement is an example
of:
A. A fact
B. A theory
, 4|Page
C. A law
D. A hypothesis
Correct Answer: C. A law
Rationale: A law is a general statement about natural phenomena based on
observations that describes how variables are related. This statement describes a
consistent relationship between variables.
6. Place the steps of the scientific method in the correct order.
A. Analyze results
B. Observe a phenomenon
C. Develop a hypothesis
D. Design an experiment
E. Ask a question
F. Interpret results
G. Implement experiment and collect data
H. Make predictions
Correct Answer: B, E, C, H, D, G, A, F
