GBIO 200 Stiller Exams 1–4 | Complete Questions with
Answers & Rationales | Complete Cell Biology Exam
Prep | INSTANT PDF DOWNLOAD
Coverage Across the Questions
Exam 1: Cell theory, chemistry, macromolecules, organelles, cytoskeleton,
membranes, membrane transport
Exam 2: Enzymes, thermodynamics, ATP, metabolism, glycolysis, cellular
respiration, electron transport, chemiosmosis
Exam 3: DNA replication, transcription, RNA processing, translation, mutations,
gene regulation, mitosis, meiosis, cell-cycle control
Exam 4: Cell signaling, GPCRs, RTKs, Ras, second messengers, phosphorylation
cascades, neurotransmission, apoptosis, autophagy, protein trafficking, integrated
cell regulation
EXAM 1 — CELL STRUCTURE, CHEMISTRY & MACROMOLECULES
Question 1
Which statement best describes the fundamental principle of modern cell theory?
A. Only multicellular organisms contain cells.
B. Cells arise spontaneously from nonliving material.
C. Cells are the basic structural and functional units of living organisms.
D. All cells contain membrane-bound organelles.
Rationale: Cell theory identifies the cell as the fundamental unit of biological structure and
function.
,Question 2
Which feature most directly distinguishes a eukaryotic cell from a prokaryotic cell?
A. Presence of DNA
B. Presence of ribosomes
C. Presence of a plasma membrane
D. Presence of a membrane-bound nucleus
Rationale: Eukaryotic cells contain a membrane-enclosed nucleus, whereas prokaryotes
lack one.
Question 3
Why is carbon particularly important to biological molecules?
A. Carbon readily forms ionic bonds only.
B. Carbon can form four covalent bonds and create diverse molecular structures.
C. Carbon cannot bond with hydrogen.
D. Carbon is always positively charged.
Rationale: Carbon's four valence electrons permit extensive structural diversity.
Question 4
A molecule contains many hydroxyl groups and dissolves readily in water. Which property
best explains this behavior?
,A. It is highly hydrophobic.
B. It contains only nonpolar bonds.
C. Its polar groups can interact with water molecules.
D. It contains many carbon-carbon double bonds.
Rationale: Polar functional groups form favorable interactions with polar water molecules.
Question 5
Which interaction is primarily responsible for stabilizing the structure of a water molecule
itself?
A. Ionic bonding
B. Hydrogen bonding
C. Covalent bonding between oxygen and hydrogen
D. Peptide bonding
Rationale: The O–H bonds within a water molecule are polar covalent bonds.
Question 6
Why does water have a relatively high heat capacity?
A. Water molecules cannot interact with each other.
B. Energy can be absorbed through disruption of hydrogen-bond interactions.
, C. Water contains many peptide bonds.
D. Water is completely nonpolar.
Rationale: Hydrogen bonding allows water to absorb substantial heat with relatively modest
temperature change.
Question 7
A solution with a pH of 3 has what characteristic?
A. It is strongly basic.
B. It has fewer hydrogen ions than pure water.
C. It has a relatively high concentration of hydrogen ions.
D. It contains no hydroxide ions.
Rationale: Lower pH corresponds to greater hydrogen-ion concentration.
Question 8
Which functional group commonly acts as a proton donor?
A. Methyl
B. Amino
C. Phosphate
D. Carboxyl
Rationale: Carboxyl groups can donate H⁺ and therefore often contribute acidic properties.
Answers & Rationales | Complete Cell Biology Exam
Prep | INSTANT PDF DOWNLOAD
Coverage Across the Questions
Exam 1: Cell theory, chemistry, macromolecules, organelles, cytoskeleton,
membranes, membrane transport
Exam 2: Enzymes, thermodynamics, ATP, metabolism, glycolysis, cellular
respiration, electron transport, chemiosmosis
Exam 3: DNA replication, transcription, RNA processing, translation, mutations,
gene regulation, mitosis, meiosis, cell-cycle control
Exam 4: Cell signaling, GPCRs, RTKs, Ras, second messengers, phosphorylation
cascades, neurotransmission, apoptosis, autophagy, protein trafficking, integrated
cell regulation
EXAM 1 — CELL STRUCTURE, CHEMISTRY & MACROMOLECULES
Question 1
Which statement best describes the fundamental principle of modern cell theory?
A. Only multicellular organisms contain cells.
B. Cells arise spontaneously from nonliving material.
C. Cells are the basic structural and functional units of living organisms.
D. All cells contain membrane-bound organelles.
Rationale: Cell theory identifies the cell as the fundamental unit of biological structure and
function.
,Question 2
Which feature most directly distinguishes a eukaryotic cell from a prokaryotic cell?
A. Presence of DNA
B. Presence of ribosomes
C. Presence of a plasma membrane
D. Presence of a membrane-bound nucleus
Rationale: Eukaryotic cells contain a membrane-enclosed nucleus, whereas prokaryotes
lack one.
Question 3
Why is carbon particularly important to biological molecules?
A. Carbon readily forms ionic bonds only.
B. Carbon can form four covalent bonds and create diverse molecular structures.
C. Carbon cannot bond with hydrogen.
D. Carbon is always positively charged.
Rationale: Carbon's four valence electrons permit extensive structural diversity.
Question 4
A molecule contains many hydroxyl groups and dissolves readily in water. Which property
best explains this behavior?
,A. It is highly hydrophobic.
B. It contains only nonpolar bonds.
C. Its polar groups can interact with water molecules.
D. It contains many carbon-carbon double bonds.
Rationale: Polar functional groups form favorable interactions with polar water molecules.
Question 5
Which interaction is primarily responsible for stabilizing the structure of a water molecule
itself?
A. Ionic bonding
B. Hydrogen bonding
C. Covalent bonding between oxygen and hydrogen
D. Peptide bonding
Rationale: The O–H bonds within a water molecule are polar covalent bonds.
Question 6
Why does water have a relatively high heat capacity?
A. Water molecules cannot interact with each other.
B. Energy can be absorbed through disruption of hydrogen-bond interactions.
, C. Water contains many peptide bonds.
D. Water is completely nonpolar.
Rationale: Hydrogen bonding allows water to absorb substantial heat with relatively modest
temperature change.
Question 7
A solution with a pH of 3 has what characteristic?
A. It is strongly basic.
B. It has fewer hydrogen ions than pure water.
C. It has a relatively high concentration of hydrogen ions.
D. It contains no hydroxide ions.
Rationale: Lower pH corresponds to greater hydrogen-ion concentration.
Question 8
Which functional group commonly acts as a proton donor?
A. Methyl
B. Amino
C. Phosphate
D. Carboxyl
Rationale: Carboxyl groups can donate H⁺ and therefore often contribute acidic properties.
