Biological Science, 8th Edition
Original Test Bank — Chapters 1–18
Authors: Scott Freeman, Kim Quillin, Lizabeth Allison, Michael Black, Jeff Carmichael,
Emily Taylor, Greg Podgorski, and Jeremy Hsu
Format: Multiple-choice questions with answer key and brief rationale
Edition: 8th edition, Pearson, 2024
Chapter 1 — Biology: The Study of Life
1. Which statement best describes a scientific hypothesis?
A. A conclusion that can never be changed
B. A testable explanation for an observation
C. A collection of unrelated observations
D. A statement that has already been proven true
Answer: B. A hypothesis is a proposed explanation that generates testable predictions.
2. Why is evolution considered a central concept in biology?
A. It explains only the origin of Earth.
B. It applies only to organisms with sexual reproduction.
C. It provides a framework for explaining both the diversity and relatedness of organisms.
D. It replaces the need for experimentation.
Answer: C. Evolution explains patterns of biological diversity and common ancestry.
Chapter 2 — Water and Carbon: The Chemical Basis of
Life
3. The relatively high boiling point of water is primarily a consequence of:
A. Ionic bonds between water molecules
B. Hydrogen bonding between water molecules
C. Covalent bonds between separate water molecules
D. Nonpolar interactions between hydrogen atoms
Answer: B. Hydrogen bonds require substantial energy to disrupt, contributing to water's
high boiling point.
4. Why is carbon particularly important in biological molecules?
,A. It can form four covalent bonds.
B. It always forms ionic bonds.
C. It cannot bond to hydrogen.
D. It is always positively charged.
Answer: A. Carbon's four valence electrons allow it to form diverse and complex molecular
structures.
Chapter 3 — Protein Structure and Function
5. The primary structure of a protein refers to its:
A. Overall three-dimensional shape
B. Arrangement of multiple polypeptide chains
C. Sequence of amino acids
D. Pattern of hydrogen bonds
Answer: C. Primary structure is the linear amino-acid sequence.
6. A mutation changes one amino acid in an enzyme's active site. Why could this
substantially alter enzyme activity?
A. The amino-acid sequence has no effect on protein structure.
B. The substitution may alter interactions that determine the protein's three-dimensional
structure.
C. All amino acids have identical chemical properties.
D. Enzymes do not have specific binding sites.
Answer: B. Changes in amino-acid chemistry can alter folding or active-site geometry.
Chapter 4 — Nucleic Acids and an RNA World
7. Which molecule contains ribose rather than deoxyribose?
A. DNA
B. RNA
C. Both DNA and RNA
D. Neither
Answer: B. RNA contains ribose; DNA contains deoxyribose.
8. The RNA-world hypothesis proposes that early RNA molecules may have:
A. Functioned only as structural lipids
B. Served both informational and catalytic roles
, C. Replaced all proteins in modern organisms
D. Been incapable of self-replication
Answer: B. RNA can store sequence information and some RNA molecules can catalyze
chemical reactions.
Chapter 5 — An Introduction to Carbohydrates
9. Which molecule is a monosaccharide?
A. Glucose
B. Glycogen
C. Cellulose
D. Starch
Answer: A. Glucose is a single sugar unit.
10. The primary function of cellulose in plants is:
A. Long-term energy storage in animals
B. Structural support in cell walls
C. Catalysis of metabolic reactions
D. Storage of genetic information
Answer: B. Cellulose forms strong structural fibers in plant cell walls.
Chapter 6 — Lipids, Membranes, and the First Cells
11. Phospholipids spontaneously form bilayers in water primarily because they:
A. Are entirely nonpolar
B. Have hydrophilic heads and hydrophobic tails
C. Have only charged tails
D. Are composed entirely of proteins
Answer: B. Their amphipathic structure causes hydrophobic tails to avoid water while polar
heads interact with it.
12. Which property is most important for a membrane to function as a selective barrier?
A. Complete permeability to all molecules
B. Hydrophobicity of the membrane interior
C. Absence of phospholipids
D. Permanent rigidity
Original Test Bank — Chapters 1–18
Authors: Scott Freeman, Kim Quillin, Lizabeth Allison, Michael Black, Jeff Carmichael,
Emily Taylor, Greg Podgorski, and Jeremy Hsu
Format: Multiple-choice questions with answer key and brief rationale
Edition: 8th edition, Pearson, 2024
Chapter 1 — Biology: The Study of Life
1. Which statement best describes a scientific hypothesis?
A. A conclusion that can never be changed
B. A testable explanation for an observation
C. A collection of unrelated observations
D. A statement that has already been proven true
Answer: B. A hypothesis is a proposed explanation that generates testable predictions.
2. Why is evolution considered a central concept in biology?
A. It explains only the origin of Earth.
B. It applies only to organisms with sexual reproduction.
C. It provides a framework for explaining both the diversity and relatedness of organisms.
D. It replaces the need for experimentation.
Answer: C. Evolution explains patterns of biological diversity and common ancestry.
Chapter 2 — Water and Carbon: The Chemical Basis of
Life
3. The relatively high boiling point of water is primarily a consequence of:
A. Ionic bonds between water molecules
B. Hydrogen bonding between water molecules
C. Covalent bonds between separate water molecules
D. Nonpolar interactions between hydrogen atoms
Answer: B. Hydrogen bonds require substantial energy to disrupt, contributing to water's
high boiling point.
4. Why is carbon particularly important in biological molecules?
,A. It can form four covalent bonds.
B. It always forms ionic bonds.
C. It cannot bond to hydrogen.
D. It is always positively charged.
Answer: A. Carbon's four valence electrons allow it to form diverse and complex molecular
structures.
Chapter 3 — Protein Structure and Function
5. The primary structure of a protein refers to its:
A. Overall three-dimensional shape
B. Arrangement of multiple polypeptide chains
C. Sequence of amino acids
D. Pattern of hydrogen bonds
Answer: C. Primary structure is the linear amino-acid sequence.
6. A mutation changes one amino acid in an enzyme's active site. Why could this
substantially alter enzyme activity?
A. The amino-acid sequence has no effect on protein structure.
B. The substitution may alter interactions that determine the protein's three-dimensional
structure.
C. All amino acids have identical chemical properties.
D. Enzymes do not have specific binding sites.
Answer: B. Changes in amino-acid chemistry can alter folding or active-site geometry.
Chapter 4 — Nucleic Acids and an RNA World
7. Which molecule contains ribose rather than deoxyribose?
A. DNA
B. RNA
C. Both DNA and RNA
D. Neither
Answer: B. RNA contains ribose; DNA contains deoxyribose.
8. The RNA-world hypothesis proposes that early RNA molecules may have:
A. Functioned only as structural lipids
B. Served both informational and catalytic roles
, C. Replaced all proteins in modern organisms
D. Been incapable of self-replication
Answer: B. RNA can store sequence information and some RNA molecules can catalyze
chemical reactions.
Chapter 5 — An Introduction to Carbohydrates
9. Which molecule is a monosaccharide?
A. Glucose
B. Glycogen
C. Cellulose
D. Starch
Answer: A. Glucose is a single sugar unit.
10. The primary function of cellulose in plants is:
A. Long-term energy storage in animals
B. Structural support in cell walls
C. Catalysis of metabolic reactions
D. Storage of genetic information
Answer: B. Cellulose forms strong structural fibers in plant cell walls.
Chapter 6 — Lipids, Membranes, and the First Cells
11. Phospholipids spontaneously form bilayers in water primarily because they:
A. Are entirely nonpolar
B. Have hydrophilic heads and hydrophobic tails
C. Have only charged tails
D. Are composed entirely of proteins
Answer: B. Their amphipathic structure causes hydrophobic tails to avoid water while polar
heads interact with it.
12. Which property is most important for a membrane to function as a selective barrier?
A. Complete permeability to all molecules
B. Hydrophobicity of the membrane interior
C. Absence of phospholipids
D. Permanent rigidity
