Pharmacy School Prerequisite Science
Practice: 250 Exam-Style Questions
with Answer Rationales
PHARMACY PREREQUISITE BIOLOGY PRACTICE — PART 1 of 5
Aligned to Campbell Biology, 12th Edition (Urry, Cain, Wasserman, Minorsky, Orr; Pearson)
TABLE OF CONTENTS
Cell Structure and Function — Questions 1-8
Biomolecules and Enzymes — Questions 9-16
Cellular Respiration and Metabolism — Questions 17-24
Genetics and Molecular Biology — Questions 25-32
Microbiology Fundamentals — Questions 33-40
Human Anatomy and Physiology Basics — Questions 41-50
Q1. Which organelle is the primary site of ATP synthesis in eukaryotic cells?
A. Golgi apparatus
B. Mitochondrion
C. Lysosome
D. Smooth endoplasmic reticulum
Correct Answer: Mitochondrion ✅
Rationale: The mitochondrion is the site of oxidative phosphorylation, where the electron transport
chain and ATP synthase generate most cellular ATP. The Golgi apparatus modifies and packages
proteins. Lysosomes contain hydrolytic enzymes for intracellular digestion. The smooth endoplasmic
reticulum synthesizes lipids and detoxifies compounds.
Q2. Which structure regulates the movement of substances into and out of a eukaryotic cell?
,A. Cell wall
B. Nucleolus
C. Plasma membrane
D. Cytoskeleton
Correct Answer: Plasma membrane ✅
Rationale: The plasma membrane is a selectively permeable phospholipid bilayer that controls
transport via channels, carriers, and pumps. The cell wall provides structural support but does not
regulate molecular traffic. The nucleolus assembles ribosomal subunits. The cytoskeleton maintains
shape and enables intracellular movement.
Q3. A student observes a cell with no nucleus and no membrane-bound organelles. This cell most
likely belongs to which group?
A. Fungi
B. Protista
C. Bacteria
D. Plantae
Correct Answer: Bacteria ✅
Rationale: Bacteria are prokaryotes, lacking a membrane-bound nucleus and organelles. Fungi,
protists, and plants are all eukaryotes with nuclei and membrane-bound compartments such as
mitochondria and endoplasmic reticulum.
Q4. Which process moves water across a semipermeable membrane from low to high solute
concentration?
A. Osmosis
B. Active transport
C. Phagocytosis
D. Facilitated diffusion
Correct Answer: Osmosis ✅
Rationale: Osmosis is the passive diffusion of water down its concentration gradient across a
selectively permeable membrane. Active transport requires ATP and moves solutes against gradients.
Phagocytosis is engulfment of large particles. Facilitated diffusion uses proteins to move solutes, not
water specifically, down their gradients.
,Q5. Which organelle is responsible for modifying, sorting, and packaging proteins for secretion?
A. Ribosome
B. Golgi apparatus
C. Peroxisome
D. Nucleus
Correct Answer: Golgi apparatus ✅
Rationale: The Golgi apparatus receives proteins from the endoplasmic reticulum, modifies them,
and packages them into vesicles for secretion or delivery. Ribosomes synthesize proteins but do not
sort them. Peroxisomes break down fatty acids and detoxify. The nucleus stores genetic material.
Q6. Which statement best distinguishes prokaryotic from eukaryotic cells?
A. Prokaryotes lack ribosomes.
B. Prokaryotes lack a membrane-bound nucleus.
C. Prokaryotes lack a plasma membrane.
D. Prokaryotes lack genetic material.
Correct Answer: Prokaryotes lack a membrane-bound nucleus. ✅
Rationale: The defining feature of prokaryotes is the absence of a membrane-bound nucleus; their
DNA resides in the nucleoid region. Prokaryotes do have ribosomes, a plasma membrane, and
genetic material, so the other options are factually incorrect.
Q7. The sodium-potassium pump moves ions against their concentration gradients. This is an
example of which transport type?
A. Simple diffusion
B. Osmosis
C. Active transport
D. Facilitated diffusion
Correct Answer: Active transport ✅
Rationale: Active transport uses ATP to move ions against their concentration gradients, as the
sodium-potassium pump does. Simple diffusion and osmosis are passive and move substances down
gradients. Facilitated diffusion is also passive, using proteins but without energy expenditure.
Q8. Which cellular structure contains digestive enzymes and functions in intracellular breakdown of
worn-out organelles?
, A. Lysosome
B. Chloroplast
C. Mitochondrion
D. Nucleolus
Correct Answer: Lysosome ✅
Rationale: Lysosomes are acidic vesicles containing hydrolytic enzymes that digest macromolecules
and damaged organelles via autophagy. Chloroplasts perform photosynthesis. Mitochondria generate
ATP. The nucleolus assembles ribosomal subunits.
Q9. Which macromolecule is composed of amino acids linked by peptide bonds?
A. Carbohydrate
B. Lipid
C. Protein
D. Nucleic acid
Correct Answer: Protein ✅
Rationale: Proteins are polymers of amino acids joined by peptide bonds. Carbohydrates are
composed of monosaccharides linked by glycosidic bonds. Lipids are largely nonpolymeric and
hydrophobic. Nucleic acids are polymers of nucleotides linked by phosphodiester bonds.
Q10. Which bond type forms between the glycerol backbone and fatty acids in a triglyceride?
A. Peptide bond
B. Ester bond
C. Glycosidic bond
D. Hydrogen bond
Correct Answer: Ester bond ✅
Rationale: Triglycerides form when fatty acids are joined to glycerol by ester bonds between the
carboxyl group of the fatty acid and a hydroxyl group of glycerol. Peptide bonds link amino acids.
Glycosidic bonds link sugars. Hydrogen bonds are weak noncovalent interactions.
Q11. An enzyme increases the rate of a reaction primarily by which mechanism?
A. Increasing the activation energy
B. Lowering the activation energy
Practice: 250 Exam-Style Questions
with Answer Rationales
PHARMACY PREREQUISITE BIOLOGY PRACTICE — PART 1 of 5
Aligned to Campbell Biology, 12th Edition (Urry, Cain, Wasserman, Minorsky, Orr; Pearson)
TABLE OF CONTENTS
Cell Structure and Function — Questions 1-8
Biomolecules and Enzymes — Questions 9-16
Cellular Respiration and Metabolism — Questions 17-24
Genetics and Molecular Biology — Questions 25-32
Microbiology Fundamentals — Questions 33-40
Human Anatomy and Physiology Basics — Questions 41-50
Q1. Which organelle is the primary site of ATP synthesis in eukaryotic cells?
A. Golgi apparatus
B. Mitochondrion
C. Lysosome
D. Smooth endoplasmic reticulum
Correct Answer: Mitochondrion ✅
Rationale: The mitochondrion is the site of oxidative phosphorylation, where the electron transport
chain and ATP synthase generate most cellular ATP. The Golgi apparatus modifies and packages
proteins. Lysosomes contain hydrolytic enzymes for intracellular digestion. The smooth endoplasmic
reticulum synthesizes lipids and detoxifies compounds.
Q2. Which structure regulates the movement of substances into and out of a eukaryotic cell?
,A. Cell wall
B. Nucleolus
C. Plasma membrane
D. Cytoskeleton
Correct Answer: Plasma membrane ✅
Rationale: The plasma membrane is a selectively permeable phospholipid bilayer that controls
transport via channels, carriers, and pumps. The cell wall provides structural support but does not
regulate molecular traffic. The nucleolus assembles ribosomal subunits. The cytoskeleton maintains
shape and enables intracellular movement.
Q3. A student observes a cell with no nucleus and no membrane-bound organelles. This cell most
likely belongs to which group?
A. Fungi
B. Protista
C. Bacteria
D. Plantae
Correct Answer: Bacteria ✅
Rationale: Bacteria are prokaryotes, lacking a membrane-bound nucleus and organelles. Fungi,
protists, and plants are all eukaryotes with nuclei and membrane-bound compartments such as
mitochondria and endoplasmic reticulum.
Q4. Which process moves water across a semipermeable membrane from low to high solute
concentration?
A. Osmosis
B. Active transport
C. Phagocytosis
D. Facilitated diffusion
Correct Answer: Osmosis ✅
Rationale: Osmosis is the passive diffusion of water down its concentration gradient across a
selectively permeable membrane. Active transport requires ATP and moves solutes against gradients.
Phagocytosis is engulfment of large particles. Facilitated diffusion uses proteins to move solutes, not
water specifically, down their gradients.
,Q5. Which organelle is responsible for modifying, sorting, and packaging proteins for secretion?
A. Ribosome
B. Golgi apparatus
C. Peroxisome
D. Nucleus
Correct Answer: Golgi apparatus ✅
Rationale: The Golgi apparatus receives proteins from the endoplasmic reticulum, modifies them,
and packages them into vesicles for secretion or delivery. Ribosomes synthesize proteins but do not
sort them. Peroxisomes break down fatty acids and detoxify. The nucleus stores genetic material.
Q6. Which statement best distinguishes prokaryotic from eukaryotic cells?
A. Prokaryotes lack ribosomes.
B. Prokaryotes lack a membrane-bound nucleus.
C. Prokaryotes lack a plasma membrane.
D. Prokaryotes lack genetic material.
Correct Answer: Prokaryotes lack a membrane-bound nucleus. ✅
Rationale: The defining feature of prokaryotes is the absence of a membrane-bound nucleus; their
DNA resides in the nucleoid region. Prokaryotes do have ribosomes, a plasma membrane, and
genetic material, so the other options are factually incorrect.
Q7. The sodium-potassium pump moves ions against their concentration gradients. This is an
example of which transport type?
A. Simple diffusion
B. Osmosis
C. Active transport
D. Facilitated diffusion
Correct Answer: Active transport ✅
Rationale: Active transport uses ATP to move ions against their concentration gradients, as the
sodium-potassium pump does. Simple diffusion and osmosis are passive and move substances down
gradients. Facilitated diffusion is also passive, using proteins but without energy expenditure.
Q8. Which cellular structure contains digestive enzymes and functions in intracellular breakdown of
worn-out organelles?
, A. Lysosome
B. Chloroplast
C. Mitochondrion
D. Nucleolus
Correct Answer: Lysosome ✅
Rationale: Lysosomes are acidic vesicles containing hydrolytic enzymes that digest macromolecules
and damaged organelles via autophagy. Chloroplasts perform photosynthesis. Mitochondria generate
ATP. The nucleolus assembles ribosomal subunits.
Q9. Which macromolecule is composed of amino acids linked by peptide bonds?
A. Carbohydrate
B. Lipid
C. Protein
D. Nucleic acid
Correct Answer: Protein ✅
Rationale: Proteins are polymers of amino acids joined by peptide bonds. Carbohydrates are
composed of monosaccharides linked by glycosidic bonds. Lipids are largely nonpolymeric and
hydrophobic. Nucleic acids are polymers of nucleotides linked by phosphodiester bonds.
Q10. Which bond type forms between the glycerol backbone and fatty acids in a triglyceride?
A. Peptide bond
B. Ester bond
C. Glycosidic bond
D. Hydrogen bond
Correct Answer: Ester bond ✅
Rationale: Triglycerides form when fatty acids are joined to glycerol by ester bonds between the
carboxyl group of the fatty acid and a hydroxyl group of glycerol. Peptide bonds link amino acids.
Glycosidic bonds link sugars. Hydrogen bonds are weak noncovalent interactions.
Q11. An enzyme increases the rate of a reaction primarily by which mechanism?
A. Increasing the activation energy
B. Lowering the activation energy
