ESSENTIALS OF BIOLOGY 7TH EDITION QUESTION
BANK | COMPLETE CHAPTERS 1–32 + ANSWERS
ESSENTIALS OF BIOLOGY — 7TH EDITION
Complete Chapters 1–32 Exam & Question Bank
Based on: Sylvia S. Mader & Michael Windelspecht
Academic Year: 2026/2027
Comprehensive Exam Preparation Resource
120 Original Questions • Answers • Detailed Rationales • Chapters 1–32
Table of Contents
Section Content
I Introduction — Questions 1–20
II Core Concepts — Questions 21–60
III Applied Scenarios — Questions 61–85
IV Critical Thinking — Questions 86–105
V Review Questions — Questions 106–120
— Answer & Rationale Included After Every Question
Chapter Coverage
Chapter 1: Biology: The Science of Life
Chapter 2: The Chemical Basis of Life
Chapter 3: The Organic Molecules of Life
Chapter 4: Inside the Cell
Chapter 5: The Dynamic Cell
Chapter 6: Energy for Life
Chapter 7: Energy for Cells
Chapter 8: Cellular Reproduction
,Chapter 9: Meiosis and the Genetic Basis of Sexual Reproduction
Chapter 10: Patterns of Inheritance
Chapter 11: The Instructions for Life: DNA and RNA
Chapter 12: Biotechnology and Genomics
Chapter 13: Mutations and Genetic Testing
Chapter 14: Darwin and Evolution
Chapter 15: Evolution on a Small Scale
Chapter 16: Evolution on a Large Scale
Chapter 17: Viruses, Bacteria, and Protists
Chapter 18: Plants and Fungi
Chapter 19: Animals
Chapter 20: Plant Anatomy and Growth
Chapter 21: Plant Responses and Reproduction
Chapter 22: Organization of the Animal Body and Homeostasis
Chapter 23: The Transport Systems
Chapter 24: The Maintenance Systems
Chapter 25: Digestion and Human Nutrition
Chapter 26: Defenses Against Disease
Chapter 27: The Control Systems
Chapter 28: Sensory Input and Motor Output
Chapter 29: Reproduction, Development, and Aging
Chapter 30: Ecology and Populations
Chapter 31: Communities and Ecosystems
Chapter 32: Human Impact on the Biosphere
SECTION I — INTRODUCTION
Questions 1–20
Question 1 — Chapter 1
Which characteristic is shared by all organisms?
A. They produce oxygen.
B. They maintain some form of internal organization.
C. They reproduce sexually.
D. They obtain energy directly from sunlight.
Correct answer: B
,Rationale: Living organisms exhibit organized structures and processes. Not every organism
performs photosynthesis or sexual reproduction, and some obtain energy from chemical
compounds rather than sunlight.
Question 2 — Chapter 1
What is the primary purpose of a scientific hypothesis?
A. To serve as an unquestionable explanation
B. To summarize all existing scientific knowledge
C. To provide a testable proposed explanation
D. To guarantee the outcome of an experiment
Correct answer: C
Rationale: A hypothesis is a proposed explanation that can be tested through observation or
experimentation. Scientific hypotheses may be supported, modified, or rejected as evidence
accumulates.
Question 3 — Chapter 1
A researcher changes the amount of fertilizer supplied to plants and measures plant growth. What
is the independent variable?
Correct answer: Amount of fertilizer.
Rationale: The independent variable is the factor deliberately manipulated by the researcher.
Plant growth is the dependent variable because it is the measured response.
Question 4 — Chapter 2
Which type of bond involves the sharing of electrons between atoms?
A. Ionic
B. Covalent
C. Hydrogen
D. Peptide
Correct answer: B
Rationale: Covalent bonds form when atoms share electrons. Ionic bonds instead involve
electron transfer and attraction between oppositely charged ions.
, Question 5 — Chapter 2
Why is water considered an excellent solvent for many biological substances?
A. It is nonpolar.
B. Its molecules have no electrical charge distribution.
C. Its polarity allows it to interact with charged and polar substances.
D. It cannot form hydrogen bonds.
Correct answer: C
Rationale: Water is polar, meaning its electrons are distributed unevenly. This polarity allows
water to surround and interact with ions and other polar molecules.
Question 6 — Chapter 2
A solution with a pH of 3 is best described as:
A. Strongly acidic
B. Neutral
C. Slightly basic
D. Strongly basic
Correct answer: A
Rationale: The pH scale measures hydrogen-ion concentration. Values below 7 are acidic, with
lower values representing greater acidity.
Question 7 — Chapter 3
Which class of biological molecules includes enzymes?
A. Carbohydrates
B. Lipids
C. Proteins
D. Nucleic acids
Correct answer: C
Rationale: Most biological enzymes are proteins whose three-dimensional structures allow them
to catalyze specific chemical reactions.
BANK | COMPLETE CHAPTERS 1–32 + ANSWERS
ESSENTIALS OF BIOLOGY — 7TH EDITION
Complete Chapters 1–32 Exam & Question Bank
Based on: Sylvia S. Mader & Michael Windelspecht
Academic Year: 2026/2027
Comprehensive Exam Preparation Resource
120 Original Questions • Answers • Detailed Rationales • Chapters 1–32
Table of Contents
Section Content
I Introduction — Questions 1–20
II Core Concepts — Questions 21–60
III Applied Scenarios — Questions 61–85
IV Critical Thinking — Questions 86–105
V Review Questions — Questions 106–120
— Answer & Rationale Included After Every Question
Chapter Coverage
Chapter 1: Biology: The Science of Life
Chapter 2: The Chemical Basis of Life
Chapter 3: The Organic Molecules of Life
Chapter 4: Inside the Cell
Chapter 5: The Dynamic Cell
Chapter 6: Energy for Life
Chapter 7: Energy for Cells
Chapter 8: Cellular Reproduction
,Chapter 9: Meiosis and the Genetic Basis of Sexual Reproduction
Chapter 10: Patterns of Inheritance
Chapter 11: The Instructions for Life: DNA and RNA
Chapter 12: Biotechnology and Genomics
Chapter 13: Mutations and Genetic Testing
Chapter 14: Darwin and Evolution
Chapter 15: Evolution on a Small Scale
Chapter 16: Evolution on a Large Scale
Chapter 17: Viruses, Bacteria, and Protists
Chapter 18: Plants and Fungi
Chapter 19: Animals
Chapter 20: Plant Anatomy and Growth
Chapter 21: Plant Responses and Reproduction
Chapter 22: Organization of the Animal Body and Homeostasis
Chapter 23: The Transport Systems
Chapter 24: The Maintenance Systems
Chapter 25: Digestion and Human Nutrition
Chapter 26: Defenses Against Disease
Chapter 27: The Control Systems
Chapter 28: Sensory Input and Motor Output
Chapter 29: Reproduction, Development, and Aging
Chapter 30: Ecology and Populations
Chapter 31: Communities and Ecosystems
Chapter 32: Human Impact on the Biosphere
SECTION I — INTRODUCTION
Questions 1–20
Question 1 — Chapter 1
Which characteristic is shared by all organisms?
A. They produce oxygen.
B. They maintain some form of internal organization.
C. They reproduce sexually.
D. They obtain energy directly from sunlight.
Correct answer: B
,Rationale: Living organisms exhibit organized structures and processes. Not every organism
performs photosynthesis or sexual reproduction, and some obtain energy from chemical
compounds rather than sunlight.
Question 2 — Chapter 1
What is the primary purpose of a scientific hypothesis?
A. To serve as an unquestionable explanation
B. To summarize all existing scientific knowledge
C. To provide a testable proposed explanation
D. To guarantee the outcome of an experiment
Correct answer: C
Rationale: A hypothesis is a proposed explanation that can be tested through observation or
experimentation. Scientific hypotheses may be supported, modified, or rejected as evidence
accumulates.
Question 3 — Chapter 1
A researcher changes the amount of fertilizer supplied to plants and measures plant growth. What
is the independent variable?
Correct answer: Amount of fertilizer.
Rationale: The independent variable is the factor deliberately manipulated by the researcher.
Plant growth is the dependent variable because it is the measured response.
Question 4 — Chapter 2
Which type of bond involves the sharing of electrons between atoms?
A. Ionic
B. Covalent
C. Hydrogen
D. Peptide
Correct answer: B
Rationale: Covalent bonds form when atoms share electrons. Ionic bonds instead involve
electron transfer and attraction between oppositely charged ions.
, Question 5 — Chapter 2
Why is water considered an excellent solvent for many biological substances?
A. It is nonpolar.
B. Its molecules have no electrical charge distribution.
C. Its polarity allows it to interact with charged and polar substances.
D. It cannot form hydrogen bonds.
Correct answer: C
Rationale: Water is polar, meaning its electrons are distributed unevenly. This polarity allows
water to surround and interact with ions and other polar molecules.
Question 6 — Chapter 2
A solution with a pH of 3 is best described as:
A. Strongly acidic
B. Neutral
C. Slightly basic
D. Strongly basic
Correct answer: A
Rationale: The pH scale measures hydrogen-ion concentration. Values below 7 are acidic, with
lower values representing greater acidity.
Question 7 — Chapter 3
Which class of biological molecules includes enzymes?
A. Carbohydrates
B. Lipids
C. Proteins
D. Nucleic acids
Correct answer: C
Rationale: Most biological enzymes are proteins whose three-dimensional structures allow them
to catalyze specific chemical reactions.
