UMN BIOL 1009 MIDTERM & FINAL EXAM – QUESTIONS AND ANSWERS |
VERIFIED AND WELL DETAILED ANSWERS | PLUS RATIONALES | DOWNLOAD
AND PASS | LATEST EXAM UPDATE 2026/2027
Core Domains
Structure and Function of Biological Molecules
Cell Structure and Function
Energy Recruitment and Utilization
Cellular Reproduction
Flow of Genetic Information
Principles of Inheritance
Mechanisms of Evolution
Biological Diversity
Ecology
Introduction
This comprehensive examination assesses foundational and applied knowledge
in general biology for non-CBS majors. The assessment evaluates understanding
of molecular structure, cellular processes, energy utilization, genetic information
flow, inheritance, evolution, and ecology. Questions are designed to test critical
thinking, real-world application, and decision-making skills through multiple-
choice and scenario-based formats. This exam prepares students for professional
and graduate school expectations by emphasizing conceptual understanding and
practical problem-solving across all major biological domains.
,SECTION ONE: QUESTIONS 1–50
1. A solution with a pH of 12 contains what concentration of hydroxyl ions
[OH⁻]?
A. 0.01 moles/liter
B. 0.1 moles/liter
C. 0.001 moles/liter
D. 1.0 moles/liter
🟢 Correct Answer: A. 0.01 moles/liter
🔴 Explanation: pH = -log[H⁺]. At pH 12, [H⁺] = 10⁻¹² M. Since [H⁺][OH⁻] =
10⁻¹⁴, [OH⁻] = 10⁻¹⁴ / 10⁻¹² = 10⁻² = 0.01 moles/liter.
2. Molecules consisting only of carbon and hydrogen are known as:
A. Carbohydrates
B. Hydrocarbons
C. Lipids
D. Proteins
🟢 Correct Answer: B. Hydrocarbons
🔴 Explanation: Hydrocarbons are organic compounds composed exclusively
of carbon and hydrogen atoms. They form the hydrophobic tails of lipids and
are fundamental to many biological molecules.
,3. Organic chemistry is defined as the study of:
A. All chemical compounds
B. Inorganic compounds
C. Carbon compounds
D. Water-based reactions
🟢 Correct Answer: C. Carbon compounds
🔴 Explanation: Organic chemistry specifically focuses on the study of carbon-
containing compounds, their structure, properties, and reactions.
4. What would be the sequence of the DNA molecule made using the
following DNA strand as a template? 5' AATTCGC 3'
A. 5' GCGAATT 3'
B. 5' TTAAGCG 3'
C. 5' CGCUUAA 3'
D. 3' GCGAATT 5'
🟢 Correct Answer: A. 5' GCGAATT 3'
🔴 Explanation: DNA synthesis is antiparallel and complementary. The
template 5' AATTCGC 3' produces a complementary strand 3' TTAAGCG 5',
which written in the conventional 5' to 3' orientation is 5' GCGAATT 3'.
5. Intermediate filaments:
A. Are the thinnest cytoskeletal elements
B. Have diameters larger than microfilaments but smaller than microtubules
, C. Are composed primarily of tubulin
D. Are found only in plant cells
🟢 Correct Answer: B. Have diameters larger than microfilaments but smaller
than microtubules
🔴 Explanation: Intermediate filaments (8–12 nm) are intermediate in size
between microfilaments (7 nm) and microtubules (25 nm). They provide
mechanical strength to cells.
6. Which structure is NOT part of the endomembrane system?
A. Nuclear envelope
B. Golgi apparatus
C. Mitochondria
D. Plasma membrane
🟢 Correct Answer: C. Mitochondria
🔴 Explanation: The endomembrane system includes the nuclear envelope,
endoplasmic reticulum, Golgi apparatus, lysosomes, vesicles, and plasma
membrane. Mitochondria are semiautonomous organelles with their own DNA
and are not part of this system.
7. Carbon atoms typically complete their valence shells by:
A. Forming ionic bonds
B. Forming four covalent bonds with other atoms
VERIFIED AND WELL DETAILED ANSWERS | PLUS RATIONALES | DOWNLOAD
AND PASS | LATEST EXAM UPDATE 2026/2027
Core Domains
Structure and Function of Biological Molecules
Cell Structure and Function
Energy Recruitment and Utilization
Cellular Reproduction
Flow of Genetic Information
Principles of Inheritance
Mechanisms of Evolution
Biological Diversity
Ecology
Introduction
This comprehensive examination assesses foundational and applied knowledge
in general biology for non-CBS majors. The assessment evaluates understanding
of molecular structure, cellular processes, energy utilization, genetic information
flow, inheritance, evolution, and ecology. Questions are designed to test critical
thinking, real-world application, and decision-making skills through multiple-
choice and scenario-based formats. This exam prepares students for professional
and graduate school expectations by emphasizing conceptual understanding and
practical problem-solving across all major biological domains.
,SECTION ONE: QUESTIONS 1–50
1. A solution with a pH of 12 contains what concentration of hydroxyl ions
[OH⁻]?
A. 0.01 moles/liter
B. 0.1 moles/liter
C. 0.001 moles/liter
D. 1.0 moles/liter
🟢 Correct Answer: A. 0.01 moles/liter
🔴 Explanation: pH = -log[H⁺]. At pH 12, [H⁺] = 10⁻¹² M. Since [H⁺][OH⁻] =
10⁻¹⁴, [OH⁻] = 10⁻¹⁴ / 10⁻¹² = 10⁻² = 0.01 moles/liter.
2. Molecules consisting only of carbon and hydrogen are known as:
A. Carbohydrates
B. Hydrocarbons
C. Lipids
D. Proteins
🟢 Correct Answer: B. Hydrocarbons
🔴 Explanation: Hydrocarbons are organic compounds composed exclusively
of carbon and hydrogen atoms. They form the hydrophobic tails of lipids and
are fundamental to many biological molecules.
,3. Organic chemistry is defined as the study of:
A. All chemical compounds
B. Inorganic compounds
C. Carbon compounds
D. Water-based reactions
🟢 Correct Answer: C. Carbon compounds
🔴 Explanation: Organic chemistry specifically focuses on the study of carbon-
containing compounds, their structure, properties, and reactions.
4. What would be the sequence of the DNA molecule made using the
following DNA strand as a template? 5' AATTCGC 3'
A. 5' GCGAATT 3'
B. 5' TTAAGCG 3'
C. 5' CGCUUAA 3'
D. 3' GCGAATT 5'
🟢 Correct Answer: A. 5' GCGAATT 3'
🔴 Explanation: DNA synthesis is antiparallel and complementary. The
template 5' AATTCGC 3' produces a complementary strand 3' TTAAGCG 5',
which written in the conventional 5' to 3' orientation is 5' GCGAATT 3'.
5. Intermediate filaments:
A. Are the thinnest cytoskeletal elements
B. Have diameters larger than microfilaments but smaller than microtubules
, C. Are composed primarily of tubulin
D. Are found only in plant cells
🟢 Correct Answer: B. Have diameters larger than microfilaments but smaller
than microtubules
🔴 Explanation: Intermediate filaments (8–12 nm) are intermediate in size
between microfilaments (7 nm) and microtubules (25 nm). They provide
mechanical strength to cells.
6. Which structure is NOT part of the endomembrane system?
A. Nuclear envelope
B. Golgi apparatus
C. Mitochondria
D. Plasma membrane
🟢 Correct Answer: C. Mitochondria
🔴 Explanation: The endomembrane system includes the nuclear envelope,
endoplasmic reticulum, Golgi apparatus, lysosomes, vesicles, and plasma
membrane. Mitochondria are semiautonomous organelles with their own DNA
and are not part of this system.
7. Carbon atoms typically complete their valence shells by:
A. Forming ionic bonds
B. Forming four covalent bonds with other atoms
