PASSPOINT PRO SOUTHEASTERN LOUISIANA UNIVERSITY
GBIO 200
CELL BIOLOGY
EXAM 1 - 125Q
Foundations, cell chemistry, macromolecules, proteins, enzymes,
organelles, and cellular energetics
125 A-D FULL
ORIGINAL QUESTIONS ANSWER CHOICES RATIONALES
Built for focused exam review
Concept recall + application questions
Immediate answers with concise explanations
Compact layout for fast review and printing
Original practice content aligned to GBIO 200 topics
PassPoint Pro | Practice. Understand. Perform. GBIO 200
,PASSPOINT PRO | GBIO 200 CELL BIOLOGY EXAM 1 - 125Q
HOW TO USE THIS PRACTICE SET
Format: Each item includes four answer choices followed immediately by the correct answer and an explanation. Best use:
Complete a first pass without reading the answer, then use each rationale to repair weak concepts. Coverage: Foundations, cell
chemistry, macromolecules, proteins, enzymes, organelles, and cellular energetics.
QUESTIONS 1-25
1 Which term or structure best matches the following description: the uneven distribution of charge in
water that gives oxygen a partial negative charge and hydrogens partial positive charges?
A. buffer
B. water polarity
C. pH
D. covalent bond
Answer: B
Explanation: Water polarity is correct because it is the uneven distribution of charge in water that gives oxygen a partial negative charge
and hydrogens partial positive charges. A salt dissolves readily because water molecules surround and stabilize its ions. This match is
more specific than the related alternatives, which describe different structures, molecules, or processes.
2 A student is reviewing hydrogen bond. Which description is most accurate?
A. a logarithmic measure related to hydrogen ion concentration in a solution
B. an electrostatic attraction between oppositely charged ions or charged groups
C. a weak attraction involving a partially positive hydrogen and an electronegative atom
D. the uneven distribution of charge in water that gives oxygen a partial negative charge and hydrogens partial positive charges
Answer: C
Explanation: The correct description of hydrogen bond is that it is a weak attraction involving a partially positive hydrogen and an
electronegative atom. Water molecules transiently associate because hydrogen on one molecule is attracted to oxygen on another. The
other choices define different concepts and therefore do not fit this term.
3 A liver cell expands an organelle network used for drug detoxification and lipid metabolism. What is the
best explanation for the finding?
A. smooth endoplasmic reticulum
B. peroxisome
C. rough endoplasmic reticulum
D. mitochondrion
Answer: A
Explanation: Smooth endoplasmic reticulum best explains the observation because it is an ER region involved in lipid synthesis,
detoxification, and calcium storage in specialized cells. The scenario is a direct application of that function or mechanism. The distractors
are related cell-biology concepts but do not account for the key feature described.
Original practice questions with explanations Page 2
,PASSPOINT PRO | GBIO 200 CELL BIOLOGY EXAM 1 - 125Q
4 A cell undergoes the following change: Hydrolyzing this molecule releases fatty acids that can be used
for energy. Which target was most likely altered?
A. starch
B. hydrolysis
C. triglyceride
D. monosaccharide
Answer: C
Explanation: Triglyceride is the best match. It is a lipid composed of glycerol esterified to three fatty acids and used mainly for long-term
energy storage, so the stated consequence follows directly when its function is changed. The other options can influence cellular behavior,
but they do not most directly predict this specific outcome.
5 Which term-description pairing is correct?
A. nucleolus - a nuclear region where rRNA is transcribed and ribosomal subunits begin to assemble
B. rough endoplasmic reticulum - an acidic organelle containing hydrolytic enzymes that digest macromolecules and worn-out
cellular material
C. lysosome - an ER region involved in lipid synthesis, detoxification, and calcium storage in specialized cells
D. smooth endoplasmic reticulum - an ER region studded with ribosomes that synthesizes and begins processing secreted and
membrane proteins
Answer: A
Explanation: The correct pairing is nucleolus with its defining feature: a nuclear region where rRNA is transcribed and ribosomal subunits
begin to assemble. A cell producing many ribosomes has a prominent dense region inside the nucleus. The remaining pairs intentionally
mismatch a term with the description of a different concept.
6 Which option is most accurately defined as enzyme inhibition in which an inhibitor competes with
substrate for the active site?
A. Golgi apparatus
B. secondary protein structure
C. covalent bond
D. competitive inhibition
Answer: D
Explanation: Competitive inhibition is correct because it is enzyme inhibition in which an inhibitor competes with substrate for the active
site. A molecule resembling the substrate reduces enzyme activity, but high substrate concentration partially overcomes the inhibition.
This match is more specific than the related alternatives, which describe different structures, molecules, or processes.
7 Which statement best describes activation energy?
A. stacked membrane compartments that modify, sort, and package proteins and lipids for different destinations
B. a lipid composed of glycerol esterified to three fatty acids and used mainly for long-term energy storage
C. the uneven distribution of charge in water that gives oxygen a partial negative charge and hydrogens partial positive charges
D. the energy barrier that reactants must overcome before a chemical reaction can proceed
Answer: D
Explanation: The correct description of activation energy is that it is the energy barrier that reactants must overcome before a chemical
reaction can proceed. An enzyme speeds a reaction by stabilizing the transition state without changing the reaction's overall free-energy
change. The other choices define different concepts and therefore do not fit this term.
Original practice questions with explanations Page 3
, PASSPOINT PRO | GBIO 200 CELL BIOLOGY EXAM 1 - 125Q
8 A substrate fits into a specific pocket where catalytic residues promote bond rearrangement. Which
structure or process is most directly involved?
A. enzyme active site
B. eukaryotic cell
C. peptide bond
D. amino acid
Answer: A
Explanation: Enzyme active site best explains the observation because it is the region of an enzyme where substrate binds and catalysis
occurs. The scenario is a direct application of that function or mechanism. The distractors are related cell-biology concepts but do not
account for the key feature described.
9 A selective perturbation causes this outcome: Changing its abundance can alter membrane fluidity and
permeability. Which process or structure is the best match?
A. cholesterol
B. cellulose
C. starch
D. monosaccharide
Answer: A
Explanation: Cholesterol is the best match. It is a sterol that modulates animal membrane fluidity and also serves as a precursor for
steroid molecules, so the stated consequence follows directly when its function is changed. The other options can influence cellular
behavior, but they do not most directly predict this specific outcome.
10 Which term-description pairing is correct?
A. primary protein structure - the arrangement of multiple polypeptide subunits into one functional protein complex
B. denaturation - the linear sequence of amino acids in a polypeptide
C. tertiary protein structure - the overall three-dimensional shape of a single polypeptide produced by interactions among side
chains and the backbone
D. quaternary protein structure - loss of a protein's native higher-order structure without necessarily breaking its peptide backbone
Answer: C
Explanation: The correct pairing is tertiary protein structure with its defining feature: the overall three-dimensional shape of a single
polypeptide produced by interactions among side chains and the backbone. Hydrophobic side chains cluster inward while charged groups
form stabilizing interactions on the surface. The remaining pairs intentionally mismatch a term with the description of a different concept.
11 Identify the concept described here: an electrostatic attraction between oppositely charged ions or
charged groups.
A. water polarity
B. buffer
C. hydrogen bond
D. ionic interaction
Answer: D
Explanation: Ionic interaction is correct because it is an electrostatic attraction between oppositely charged ions or charged groups. A
positively charged side chain is attracted to a negatively charged side chain in a protein. This match is more specific than the related
alternatives, which describe different structures, molecules, or processes.
Original practice questions with explanations Page 4
GBIO 200
CELL BIOLOGY
EXAM 1 - 125Q
Foundations, cell chemistry, macromolecules, proteins, enzymes,
organelles, and cellular energetics
125 A-D FULL
ORIGINAL QUESTIONS ANSWER CHOICES RATIONALES
Built for focused exam review
Concept recall + application questions
Immediate answers with concise explanations
Compact layout for fast review and printing
Original practice content aligned to GBIO 200 topics
PassPoint Pro | Practice. Understand. Perform. GBIO 200
,PASSPOINT PRO | GBIO 200 CELL BIOLOGY EXAM 1 - 125Q
HOW TO USE THIS PRACTICE SET
Format: Each item includes four answer choices followed immediately by the correct answer and an explanation. Best use:
Complete a first pass without reading the answer, then use each rationale to repair weak concepts. Coverage: Foundations, cell
chemistry, macromolecules, proteins, enzymes, organelles, and cellular energetics.
QUESTIONS 1-25
1 Which term or structure best matches the following description: the uneven distribution of charge in
water that gives oxygen a partial negative charge and hydrogens partial positive charges?
A. buffer
B. water polarity
C. pH
D. covalent bond
Answer: B
Explanation: Water polarity is correct because it is the uneven distribution of charge in water that gives oxygen a partial negative charge
and hydrogens partial positive charges. A salt dissolves readily because water molecules surround and stabilize its ions. This match is
more specific than the related alternatives, which describe different structures, molecules, or processes.
2 A student is reviewing hydrogen bond. Which description is most accurate?
A. a logarithmic measure related to hydrogen ion concentration in a solution
B. an electrostatic attraction between oppositely charged ions or charged groups
C. a weak attraction involving a partially positive hydrogen and an electronegative atom
D. the uneven distribution of charge in water that gives oxygen a partial negative charge and hydrogens partial positive charges
Answer: C
Explanation: The correct description of hydrogen bond is that it is a weak attraction involving a partially positive hydrogen and an
electronegative atom. Water molecules transiently associate because hydrogen on one molecule is attracted to oxygen on another. The
other choices define different concepts and therefore do not fit this term.
3 A liver cell expands an organelle network used for drug detoxification and lipid metabolism. What is the
best explanation for the finding?
A. smooth endoplasmic reticulum
B. peroxisome
C. rough endoplasmic reticulum
D. mitochondrion
Answer: A
Explanation: Smooth endoplasmic reticulum best explains the observation because it is an ER region involved in lipid synthesis,
detoxification, and calcium storage in specialized cells. The scenario is a direct application of that function or mechanism. The distractors
are related cell-biology concepts but do not account for the key feature described.
Original practice questions with explanations Page 2
,PASSPOINT PRO | GBIO 200 CELL BIOLOGY EXAM 1 - 125Q
4 A cell undergoes the following change: Hydrolyzing this molecule releases fatty acids that can be used
for energy. Which target was most likely altered?
A. starch
B. hydrolysis
C. triglyceride
D. monosaccharide
Answer: C
Explanation: Triglyceride is the best match. It is a lipid composed of glycerol esterified to three fatty acids and used mainly for long-term
energy storage, so the stated consequence follows directly when its function is changed. The other options can influence cellular behavior,
but they do not most directly predict this specific outcome.
5 Which term-description pairing is correct?
A. nucleolus - a nuclear region where rRNA is transcribed and ribosomal subunits begin to assemble
B. rough endoplasmic reticulum - an acidic organelle containing hydrolytic enzymes that digest macromolecules and worn-out
cellular material
C. lysosome - an ER region involved in lipid synthesis, detoxification, and calcium storage in specialized cells
D. smooth endoplasmic reticulum - an ER region studded with ribosomes that synthesizes and begins processing secreted and
membrane proteins
Answer: A
Explanation: The correct pairing is nucleolus with its defining feature: a nuclear region where rRNA is transcribed and ribosomal subunits
begin to assemble. A cell producing many ribosomes has a prominent dense region inside the nucleus. The remaining pairs intentionally
mismatch a term with the description of a different concept.
6 Which option is most accurately defined as enzyme inhibition in which an inhibitor competes with
substrate for the active site?
A. Golgi apparatus
B. secondary protein structure
C. covalent bond
D. competitive inhibition
Answer: D
Explanation: Competitive inhibition is correct because it is enzyme inhibition in which an inhibitor competes with substrate for the active
site. A molecule resembling the substrate reduces enzyme activity, but high substrate concentration partially overcomes the inhibition.
This match is more specific than the related alternatives, which describe different structures, molecules, or processes.
7 Which statement best describes activation energy?
A. stacked membrane compartments that modify, sort, and package proteins and lipids for different destinations
B. a lipid composed of glycerol esterified to three fatty acids and used mainly for long-term energy storage
C. the uneven distribution of charge in water that gives oxygen a partial negative charge and hydrogens partial positive charges
D. the energy barrier that reactants must overcome before a chemical reaction can proceed
Answer: D
Explanation: The correct description of activation energy is that it is the energy barrier that reactants must overcome before a chemical
reaction can proceed. An enzyme speeds a reaction by stabilizing the transition state without changing the reaction's overall free-energy
change. The other choices define different concepts and therefore do not fit this term.
Original practice questions with explanations Page 3
, PASSPOINT PRO | GBIO 200 CELL BIOLOGY EXAM 1 - 125Q
8 A substrate fits into a specific pocket where catalytic residues promote bond rearrangement. Which
structure or process is most directly involved?
A. enzyme active site
B. eukaryotic cell
C. peptide bond
D. amino acid
Answer: A
Explanation: Enzyme active site best explains the observation because it is the region of an enzyme where substrate binds and catalysis
occurs. The scenario is a direct application of that function or mechanism. The distractors are related cell-biology concepts but do not
account for the key feature described.
9 A selective perturbation causes this outcome: Changing its abundance can alter membrane fluidity and
permeability. Which process or structure is the best match?
A. cholesterol
B. cellulose
C. starch
D. monosaccharide
Answer: A
Explanation: Cholesterol is the best match. It is a sterol that modulates animal membrane fluidity and also serves as a precursor for
steroid molecules, so the stated consequence follows directly when its function is changed. The other options can influence cellular
behavior, but they do not most directly predict this specific outcome.
10 Which term-description pairing is correct?
A. primary protein structure - the arrangement of multiple polypeptide subunits into one functional protein complex
B. denaturation - the linear sequence of amino acids in a polypeptide
C. tertiary protein structure - the overall three-dimensional shape of a single polypeptide produced by interactions among side
chains and the backbone
D. quaternary protein structure - loss of a protein's native higher-order structure without necessarily breaking its peptide backbone
Answer: C
Explanation: The correct pairing is tertiary protein structure with its defining feature: the overall three-dimensional shape of a single
polypeptide produced by interactions among side chains and the backbone. Hydrophobic side chains cluster inward while charged groups
form stabilizing interactions on the surface. The remaining pairs intentionally mismatch a term with the description of a different concept.
11 Identify the concept described here: an electrostatic attraction between oppositely charged ions or
charged groups.
A. water polarity
B. buffer
C. hydrogen bond
D. ionic interaction
Answer: D
Explanation: Ionic interaction is correct because it is an electrostatic attraction between oppositely charged ions or charged groups. A
positively charged side chain is attracted to a negatively charged side chain in a protein. This match is more specific than the related
alternatives, which describe different structures, molecules, or processes.
Original practice questions with explanations Page 4
