BIOL 240 - UW – COMPREHENSIVE QUESTIONS
AND ANSWERS | VERIFIED AND WELLDETAILED ANSWERS | DETAILED EXPLANATIONS AND
RATIONALES | COMPLETE EXAM PREPARATION STUDY GUIDE | PRACTICE QUESTIONS |
LATEST EXAM UPDATE
•
• CORE DOMAINS
•
•
• Mendelian Genetics and Heredity
• Evolution and Natural Selection
• Biodiversity, Ecology, and Conservation
• Biomolecules and Molecular Structure
• Cell Structure and Cellular Function
• Metabolism and Bioenergetics
• Animal Physiology and Homeostasis
• Plant Biology and Physiology
• Development, Reproduction, and Cell Division
• Biology, Human Health, Society, and Ecosystem Interactions
*
• INTRODUCTION
•
•
This comprehensive assessment is designed to strengthen understanding and application of
major biological principles associated with BIOL 240 at the University of Washington. The
course framework historically emphasized biology through connections among human
health, society, and the larger ecosystem, including genetics, evolution, biodiversity, ecology,
conservation, metabolism, biomolecules, cell biology, animal physiology, and plant
physiology. The questions use multiple-choice formats to assess foundational knowledge,
conceptual understanding, interpretation, quantitative reasoning, application, and biological
decision-making. Emphasis is placed on understanding mechanisms and relationships rather
than relying solely on memorization. The assessment is intended to support preparation for
examination-style questions while encouraging students to connect biological processes
across levels of organization.
*
SECTION ONE: QUESTIONS 1–100
Question 1. Which statement best describes the central principle of cell theory?
,A. All organisms contain tissues
B. All living organisms are composed of one or more cells
C. All cells contain a nucleus
D. Cells arise spontaneously from nonliving matter
Correct Answer: B. All living organisms are composed of one or more cells
Explanation: Cell theory states that cells are the basic units of life, all organisms are
composed of cells, and new cells arise from preexisting cells. Not all cells have nuclei
because prokaryotes lack membrane-bound nuclei.
Question 2. Which cellular structure is primarily responsible for regulating what enters and
leaves the cell?
A. Ribosome
B. Nucleolus
C. Plasma membrane
D. Golgi apparatus
Correct Answer: C. Plasma membrane
Explanation: The plasma membrane is a selectively permeable phospholipid bilayer
containing proteins that regulate movement of substances into and out of the cell.
Question 3. A phospholipid is amphipathic because it contains:
A. Two hydrophilic regions
B. A hydrophilic head and hydrophobic tails
C. Only hydrophobic regions
D. Proteins and nucleic acids
Correct Answer: B. A hydrophilic head and hydrophobic tails
Explanation: Phospholipids have polar, water-attracting heads and nonpolar, water-repelling
fatty acid tails. This property drives formation of biological membranes.
Question 4. Which organelle is the primary site of aerobic cellular respiration in eukaryotic
cells?
A. Lysosome
B. Mitochondrion
C. Golgi apparatus
D. Nucleus
Correct Answer: B. Mitochondrion
Explanation: Mitochondria contain the enzymes and electron transport machinery required
for major stages of aerobic cellular respiration and ATP production.
, Question 5. Which organelle modifies, sorts, and packages many proteins for transport?
A. Golgi apparatus
B. Ribosome
C. Peroxisome
D. Centrosome
Correct Answer: A. Golgi apparatus
Explanation: The Golgi apparatus receives proteins and lipids from the endoplasmic
reticulum, modifies them, and sorts them into vesicles for delivery to appropriate
destinations.
Question 6. Which structure is directly responsible for synthesizing proteins?
A. Lysosome
B. Ribosome
C. Smooth endoplasmic reticulum
D. Golgi apparatus
Correct Answer: B. Ribosome
Explanation: Ribosomes translate messenger RNA into polypeptide chains. Ribosomes may
be free in the cytosol or attached to rough endoplasmic reticulum.
Question 7. Which molecule stores hereditary information in most organisms?
A. ATP
B. DNA
C. Glucose
D. Phospholipid
Correct Answer: B. DNA
Explanation: DNA stores genetic information in the sequence of its nucleotide bases. The
information can be replicated and expressed through transcription and translation.
Question 8. Which component of a nucleotide differs among the four DNA nucleotides?
A. Phosphate group
B. Deoxyribose sugar
C. Nitrogenous base
D. Carbon skeleton
Correct Answer: C. Nitrogenous base
Explanation: DNA nucleotides contain the same type of sugar and phosphate group but
differ in their nitrogenous bases: adenine, thymine, cytosine, or guanine.
AND ANSWERS | VERIFIED AND WELLDETAILED ANSWERS | DETAILED EXPLANATIONS AND
RATIONALES | COMPLETE EXAM PREPARATION STUDY GUIDE | PRACTICE QUESTIONS |
LATEST EXAM UPDATE
•
• CORE DOMAINS
•
•
• Mendelian Genetics and Heredity
• Evolution and Natural Selection
• Biodiversity, Ecology, and Conservation
• Biomolecules and Molecular Structure
• Cell Structure and Cellular Function
• Metabolism and Bioenergetics
• Animal Physiology and Homeostasis
• Plant Biology and Physiology
• Development, Reproduction, and Cell Division
• Biology, Human Health, Society, and Ecosystem Interactions
*
• INTRODUCTION
•
•
This comprehensive assessment is designed to strengthen understanding and application of
major biological principles associated with BIOL 240 at the University of Washington. The
course framework historically emphasized biology through connections among human
health, society, and the larger ecosystem, including genetics, evolution, biodiversity, ecology,
conservation, metabolism, biomolecules, cell biology, animal physiology, and plant
physiology. The questions use multiple-choice formats to assess foundational knowledge,
conceptual understanding, interpretation, quantitative reasoning, application, and biological
decision-making. Emphasis is placed on understanding mechanisms and relationships rather
than relying solely on memorization. The assessment is intended to support preparation for
examination-style questions while encouraging students to connect biological processes
across levels of organization.
*
SECTION ONE: QUESTIONS 1–100
Question 1. Which statement best describes the central principle of cell theory?
,A. All organisms contain tissues
B. All living organisms are composed of one or more cells
C. All cells contain a nucleus
D. Cells arise spontaneously from nonliving matter
Correct Answer: B. All living organisms are composed of one or more cells
Explanation: Cell theory states that cells are the basic units of life, all organisms are
composed of cells, and new cells arise from preexisting cells. Not all cells have nuclei
because prokaryotes lack membrane-bound nuclei.
Question 2. Which cellular structure is primarily responsible for regulating what enters and
leaves the cell?
A. Ribosome
B. Nucleolus
C. Plasma membrane
D. Golgi apparatus
Correct Answer: C. Plasma membrane
Explanation: The plasma membrane is a selectively permeable phospholipid bilayer
containing proteins that regulate movement of substances into and out of the cell.
Question 3. A phospholipid is amphipathic because it contains:
A. Two hydrophilic regions
B. A hydrophilic head and hydrophobic tails
C. Only hydrophobic regions
D. Proteins and nucleic acids
Correct Answer: B. A hydrophilic head and hydrophobic tails
Explanation: Phospholipids have polar, water-attracting heads and nonpolar, water-repelling
fatty acid tails. This property drives formation of biological membranes.
Question 4. Which organelle is the primary site of aerobic cellular respiration in eukaryotic
cells?
A. Lysosome
B. Mitochondrion
C. Golgi apparatus
D. Nucleus
Correct Answer: B. Mitochondrion
Explanation: Mitochondria contain the enzymes and electron transport machinery required
for major stages of aerobic cellular respiration and ATP production.
, Question 5. Which organelle modifies, sorts, and packages many proteins for transport?
A. Golgi apparatus
B. Ribosome
C. Peroxisome
D. Centrosome
Correct Answer: A. Golgi apparatus
Explanation: The Golgi apparatus receives proteins and lipids from the endoplasmic
reticulum, modifies them, and sorts them into vesicles for delivery to appropriate
destinations.
Question 6. Which structure is directly responsible for synthesizing proteins?
A. Lysosome
B. Ribosome
C. Smooth endoplasmic reticulum
D. Golgi apparatus
Correct Answer: B. Ribosome
Explanation: Ribosomes translate messenger RNA into polypeptide chains. Ribosomes may
be free in the cytosol or attached to rough endoplasmic reticulum.
Question 7. Which molecule stores hereditary information in most organisms?
A. ATP
B. DNA
C. Glucose
D. Phospholipid
Correct Answer: B. DNA
Explanation: DNA stores genetic information in the sequence of its nucleotide bases. The
information can be replicated and expressed through transcription and translation.
Question 8. Which component of a nucleotide differs among the four DNA nucleotides?
A. Phosphate group
B. Deoxyribose sugar
C. Nitrogenous base
D. Carbon skeleton
Correct Answer: C. Nitrogenous base
Explanation: DNA nucleotides contain the same type of sugar and phosphate group but
differ in their nitrogenous bases: adenine, thymine, cytosine, or guanine.
