Anatomy and Physiology I and Human
Biology Practice Exam questions and correct
answers – Updated 2026 (Graded A+) instant
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Subject: Anatomy and Physiology I (BIO 201)
Subtopic: Introduction to Anatomy and Physiology, Chemical Basis of Life, and Cellular
Structure
Question 1: A research pathologist is examining a tissue slide and observes cells that appear to
be arranged in multiple layers. However, closer analysis reveals that every cell is in direct
contact with the basement membrane. How should this epithelium be classified?
A) Stratified squamous epithelium
B) Simple cuboidal epithelium
C) Pseudostratified columnar epithelium
D) Transitional epithelium
Correct Answer: C - Pseudostratified columnar epithelium
Rationale: Pseudostratified epithelium is characterized by cells of varying heights where all cells
touch the basement membrane, creating the illusion of stratification. Stratified squamous (A)
consists of multiple layers where only the basal layer touches the membrane. Simple cuboidal
(B) is a single layer of cube-shaped cells. Transitional (D) is specialized for distension in the
urinary tract.
Question 2: In a physiological experiment, a cell is placed into a solution that contains a high
concentration of non-permeable solutes compared to the cell's cytoplasm. What will be the
immediate osmotic effect on the cell?
A) Water will move into the cell, leading to potential lysis.
B) Water will move out of the cell, causing the cell to crenate.
C) The cell will reach an equilibrium where no net water movement occurs.
D) Solutes will move into the cell via facilitated diffusion to balance the gradient.
,Correct Answer: B - Water will move out of the cell, causing the cell to crenate.
Rationale: A solution with a higher concentration of non-permeable solutes is hypertonic
relative to the cell, drawing water out via osmosis. If water moves out, the cell shrinks
(crenates). Lysis (A) occurs in hypotonic solutions. Equilibrium (C) only occurs in isotonic
solutions. Solutes do not move into the cell (D) if they are defined as non-permeable.
Question 3: A patient presents with a deep injury that has compromised the integrity of the
basement membrane and the underlying loose connective tissue. Which layer of the skin contains
the mitotic stem cells that must proliferate to regenerate the epidermal surface?
A) Stratum corneum
B) Stratum granulosum
C) Stratum basale
D) Stratum spinosum
Correct Answer: C - Stratum basale
Rationale: The stratum basale is the deepest layer of the epidermis, containing highly mitotic
stem cells (basal cells) responsible for replacing lost epidermal cells. The stratum corneum (A)
is the superficial, dead, keratinized layer. The stratum granulosum (B) and spinosum (D) are
intermediate layers involved in keratinization and adhesion, not primary regeneration.
Question 4: During cellular stress, a protein complex within the cytoplasm is responsible for
packaging and exporting proteins meant for extracellular signaling. Which organelle is being
described?
A) Smooth endoplasmic reticulum
B) Rough endoplasmic reticulum
C) Golgi apparatus
D) Mitochondrion
Correct Answer: C - Golgi apparatus
Rationale: The Golgi apparatus modifies, sorts, and packages proteins (often synthesized by the
RER) for secretion or transport to other organelles. The RER (B) is primarily for protein
synthesis. The smooth ER (A) is for lipid synthesis and detoxification. The mitochondrion (D) is
the site of aerobic respiration.
, Question 5: A muscle biopsy reveals a defect in the cellular machinery responsible for
sequestering calcium ions after a contraction cycle. Which structure is likely dysfunctional?
A) Lysosome
B) Sarcoplasmic reticulum
C) Golgi apparatus
D) Peroxisome
Correct Answer: B - Sarcoplasmic reticulum
Rationale: The sarcoplasmic reticulum (a specialized smooth ER) is the primary reservoir for
calcium ions in muscle cells; it actively sequesters calcium to initiate relaxation. Lysosomes (A)
are for digestive processes, the Golgi (C) is for protein modification, and peroxisomes (D) are
for oxidative reactions.
Question 6: During the S-phase of the cell cycle, a failure in the enzyme responsible for
synthesizing the short RNA segment needed for DNA polymerization occurs. Which enzyme is
affected?
A) DNA Helicase
B) DNA Polymerase III
C) Primase
D) DNA Ligase
Correct Answer: C - Primase
Rationale: Primase is the RNA polymerase that synthesizes the RNA primer required for DNA
polymerase to initiate replication. Helicase (A) unwinds the DNA helix, DNA Polymerase III (B)
adds nucleotides to the chain, and Ligase (D) joins DNA fragments (Okazaki fragments).
Question 7: A histology student is identifying a tissue sample characterized by parallel collagen
bundles with minimal ground substance. What is the most appropriate identification?
A) Areolar connective tissue
B) Dense regular connective tissue
C) Dense irregular connective tissue
D) Adipose tissue
Biology Practice Exam questions and correct
answers – Updated 2026 (Graded A+) instant
download pdf
Subject: Anatomy and Physiology I (BIO 201)
Subtopic: Introduction to Anatomy and Physiology, Chemical Basis of Life, and Cellular
Structure
Question 1: A research pathologist is examining a tissue slide and observes cells that appear to
be arranged in multiple layers. However, closer analysis reveals that every cell is in direct
contact with the basement membrane. How should this epithelium be classified?
A) Stratified squamous epithelium
B) Simple cuboidal epithelium
C) Pseudostratified columnar epithelium
D) Transitional epithelium
Correct Answer: C - Pseudostratified columnar epithelium
Rationale: Pseudostratified epithelium is characterized by cells of varying heights where all cells
touch the basement membrane, creating the illusion of stratification. Stratified squamous (A)
consists of multiple layers where only the basal layer touches the membrane. Simple cuboidal
(B) is a single layer of cube-shaped cells. Transitional (D) is specialized for distension in the
urinary tract.
Question 2: In a physiological experiment, a cell is placed into a solution that contains a high
concentration of non-permeable solutes compared to the cell's cytoplasm. What will be the
immediate osmotic effect on the cell?
A) Water will move into the cell, leading to potential lysis.
B) Water will move out of the cell, causing the cell to crenate.
C) The cell will reach an equilibrium where no net water movement occurs.
D) Solutes will move into the cell via facilitated diffusion to balance the gradient.
,Correct Answer: B - Water will move out of the cell, causing the cell to crenate.
Rationale: A solution with a higher concentration of non-permeable solutes is hypertonic
relative to the cell, drawing water out via osmosis. If water moves out, the cell shrinks
(crenates). Lysis (A) occurs in hypotonic solutions. Equilibrium (C) only occurs in isotonic
solutions. Solutes do not move into the cell (D) if they are defined as non-permeable.
Question 3: A patient presents with a deep injury that has compromised the integrity of the
basement membrane and the underlying loose connective tissue. Which layer of the skin contains
the mitotic stem cells that must proliferate to regenerate the epidermal surface?
A) Stratum corneum
B) Stratum granulosum
C) Stratum basale
D) Stratum spinosum
Correct Answer: C - Stratum basale
Rationale: The stratum basale is the deepest layer of the epidermis, containing highly mitotic
stem cells (basal cells) responsible for replacing lost epidermal cells. The stratum corneum (A)
is the superficial, dead, keratinized layer. The stratum granulosum (B) and spinosum (D) are
intermediate layers involved in keratinization and adhesion, not primary regeneration.
Question 4: During cellular stress, a protein complex within the cytoplasm is responsible for
packaging and exporting proteins meant for extracellular signaling. Which organelle is being
described?
A) Smooth endoplasmic reticulum
B) Rough endoplasmic reticulum
C) Golgi apparatus
D) Mitochondrion
Correct Answer: C - Golgi apparatus
Rationale: The Golgi apparatus modifies, sorts, and packages proteins (often synthesized by the
RER) for secretion or transport to other organelles. The RER (B) is primarily for protein
synthesis. The smooth ER (A) is for lipid synthesis and detoxification. The mitochondrion (D) is
the site of aerobic respiration.
, Question 5: A muscle biopsy reveals a defect in the cellular machinery responsible for
sequestering calcium ions after a contraction cycle. Which structure is likely dysfunctional?
A) Lysosome
B) Sarcoplasmic reticulum
C) Golgi apparatus
D) Peroxisome
Correct Answer: B - Sarcoplasmic reticulum
Rationale: The sarcoplasmic reticulum (a specialized smooth ER) is the primary reservoir for
calcium ions in muscle cells; it actively sequesters calcium to initiate relaxation. Lysosomes (A)
are for digestive processes, the Golgi (C) is for protein modification, and peroxisomes (D) are
for oxidative reactions.
Question 6: During the S-phase of the cell cycle, a failure in the enzyme responsible for
synthesizing the short RNA segment needed for DNA polymerization occurs. Which enzyme is
affected?
A) DNA Helicase
B) DNA Polymerase III
C) Primase
D) DNA Ligase
Correct Answer: C - Primase
Rationale: Primase is the RNA polymerase that synthesizes the RNA primer required for DNA
polymerase to initiate replication. Helicase (A) unwinds the DNA helix, DNA Polymerase III (B)
adds nucleotides to the chain, and Ligase (D) joins DNA fragments (Okazaki fragments).
Question 7: A histology student is identifying a tissue sample characterized by parallel collagen
bundles with minimal ground substance. What is the most appropriate identification?
A) Areolar connective tissue
B) Dense regular connective tissue
C) Dense irregular connective tissue
D) Adipose tissue
