BIOL251 Human Anatomy & Physiology I w/Lab 2026 |
Module 2 Comprehensive Exam Review: 150 High-Yield
Multiple-Choice Questions with Detailed Rationales
Covering Cellular Structure, Membrane Transport,
Histology, Tissue Types, Integumentary System,
Metabolism, Enzymes, Cellular Respiration, DNA
Replication, and Protein Synthesis | LockDown Browser
Format | Portage Learning Curriculum-Aligned |
Advanced/Hard Difficulty for College-Level Allied Health
Students
SECTION 1: CELLULAR STRUCTURE & ORGANELLES (Questions
1–25)
🟢 Question 1: Which organelle is responsible for the synthesis of phospholipids and steroids,
as well as the detoxification of drugs and toxins?
A) Rough endoplasmic reticulum
B) Smooth endoplasmic reticulum
C) Golgi apparatus
D) Peroxisomes
🔴 Correct Answer: B) Smooth endoplasmic reticulum
Rationale: The smooth ER lacks ribosomes and is specialized for lipid synthesis (including
phospholipids and steroids), carbohydrate metabolism, and detoxification of drugs and toxins.
The rough ER is involved in protein synthesis, while the Golgi modifies and packages proteins.
🟢 Question 2: A patient with a genetic defect affecting mitochondrial DNA would most
directly experience impairment in which cellular process?
A) Protein synthesis
, B) ATP production via oxidative phosphorylation
C) DNA replication
D) Lipid synthesis
🔴 Correct Answer: B) ATP production via oxidative phosphorylation
Rationale: Mitochondria are the sites of aerobic respiration and ATP production through
oxidative phosphorylation. Mitochondrial DNA encodes essential proteins for the electron
transport chain, so defects directly impair ATP generation.
🟢 Question 3: Which cytoskeletal component is composed of tubulin dimers and is
responsible for intracellular transport, chromosome movement during cell division, and
ciliary/flagellar movement?
A) Microfilaments
B) Intermediate filaments
C) Microtubules
D) Actin filaments
🔴 Correct Answer: C) Microtubules
Rationale: Microtubules are hollow tubes made of α- and β-tubulin dimers. They form the
mitotic spindle, serve as tracks for organelle transport, and are the structural core of cilia and
flagella. Microfilaments are actin-based, and intermediate filaments provide structural support.
🟢 Question 4: Peroxisomes are small organelles that contain enzymes for which primary
function?
A) Protein synthesis
B) Breakdown of fatty acids and detoxification of hydrogen peroxide
C) ATP production
D) Storage of calcium ions
🔴 Correct Answer: B) Breakdown of fatty acids and detoxification of hydrogen peroxide
Rationale: Peroxisomes contain oxidative enzymes that break down fatty acids and produce
hydrogen peroxide (H₂O₂), which is then broken down by catalase into water and oxygen. They
,are essential for lipid metabolism and detoxification.
🟢 Question 5: Which of the following correctly describes the function of ribosomes?
A) Lipid synthesis and detoxification
B) Protein synthesis by translating mRNA into polypeptide chains
C) Modification and packaging of proteins for secretion
D) Digestion of worn-out organelles and cellular debris
🔴 Correct Answer: B) Protein synthesis by translating mRNA into polypeptide chains
Rationale: Ribosomes are the sites of protein synthesis, where mRNA is translated into
polypeptide chains. They are composed of rRNA and proteins and can be free in the cytoplasm
or attached to rough ER.
🟢 Question 6: A cell that is actively secreting large amounts of protein would be expected to
have a high concentration of which organelle?
A) Smooth endoplasmic reticulum
B) Lysosomes
C) Rough endoplasmic reticulum and Golgi apparatus
D) Peroxisomes
🔴 Correct Answer: C) Rough endoplasmic reticulum and Golgi apparatus
Rationale: Cells that secrete proteins (e.g., plasma cells, pancreatic acinar cells) have extensive
rough ER for protein synthesis and Golgi apparatus for modification, packaging, and secretion
of proteins.
🟢 Question 7: The nucleolus is the site of:
A) DNA replication
B) mRNA synthesis
C) Ribosomal RNA (rRNA) synthesis and ribosome assembly
D) ATP production
🔴 Correct Answer: C) Ribosomal RNA (rRNA) synthesis and ribosome assembly
, Rationale: The nucleolus is a dense region within the nucleus where rRNA is synthesized and
combined with proteins to form ribosomal subunits. It does not synthesize mRNA or replicate
DNA.
🟢 Question 8: Which membrane-bound organelle contains hydrolytic enzymes and functions
as the "digestive system" of the cell?
A) Peroxisome
B) Lysosome
C) Endosome
D) Vacuole
🔴 Correct Answer: B) Lysosome
Rationale: Lysosomes are membrane-bound vesicles containing hydrolytic (digestive) enzymes
that break down macromolecules, worn-out organelles, and pathogens. They function in
intracellular digestion and autophagy.
🟢 Question 9: The nuclear envelope is perforated by structures that regulate the movement
of molecules between the nucleus and cytoplasm. These structures are called:
A) Nuclear pores
B) Gap junctions
C) Nucleoli
D) Chromatin
🔴 Correct Answer: A) Nuclear pores
Rationale: Nuclear pores are channels in the nuclear envelope that allow selective transport of
ions, small molecules, and macromolecules (such as mRNA and proteins) between the nucleus
and cytoplasm.
🟢 Question 10: Which of the following statements about the Golgi apparatus is FALSE?
A) It modifies proteins by adding carbohydrate groups (glycosylation)
B) It packages proteins into vesicles for transport
C) It synthesizes proteins from amino acids
Module 2 Comprehensive Exam Review: 150 High-Yield
Multiple-Choice Questions with Detailed Rationales
Covering Cellular Structure, Membrane Transport,
Histology, Tissue Types, Integumentary System,
Metabolism, Enzymes, Cellular Respiration, DNA
Replication, and Protein Synthesis | LockDown Browser
Format | Portage Learning Curriculum-Aligned |
Advanced/Hard Difficulty for College-Level Allied Health
Students
SECTION 1: CELLULAR STRUCTURE & ORGANELLES (Questions
1–25)
🟢 Question 1: Which organelle is responsible for the synthesis of phospholipids and steroids,
as well as the detoxification of drugs and toxins?
A) Rough endoplasmic reticulum
B) Smooth endoplasmic reticulum
C) Golgi apparatus
D) Peroxisomes
🔴 Correct Answer: B) Smooth endoplasmic reticulum
Rationale: The smooth ER lacks ribosomes and is specialized for lipid synthesis (including
phospholipids and steroids), carbohydrate metabolism, and detoxification of drugs and toxins.
The rough ER is involved in protein synthesis, while the Golgi modifies and packages proteins.
🟢 Question 2: A patient with a genetic defect affecting mitochondrial DNA would most
directly experience impairment in which cellular process?
A) Protein synthesis
, B) ATP production via oxidative phosphorylation
C) DNA replication
D) Lipid synthesis
🔴 Correct Answer: B) ATP production via oxidative phosphorylation
Rationale: Mitochondria are the sites of aerobic respiration and ATP production through
oxidative phosphorylation. Mitochondrial DNA encodes essential proteins for the electron
transport chain, so defects directly impair ATP generation.
🟢 Question 3: Which cytoskeletal component is composed of tubulin dimers and is
responsible for intracellular transport, chromosome movement during cell division, and
ciliary/flagellar movement?
A) Microfilaments
B) Intermediate filaments
C) Microtubules
D) Actin filaments
🔴 Correct Answer: C) Microtubules
Rationale: Microtubules are hollow tubes made of α- and β-tubulin dimers. They form the
mitotic spindle, serve as tracks for organelle transport, and are the structural core of cilia and
flagella. Microfilaments are actin-based, and intermediate filaments provide structural support.
🟢 Question 4: Peroxisomes are small organelles that contain enzymes for which primary
function?
A) Protein synthesis
B) Breakdown of fatty acids and detoxification of hydrogen peroxide
C) ATP production
D) Storage of calcium ions
🔴 Correct Answer: B) Breakdown of fatty acids and detoxification of hydrogen peroxide
Rationale: Peroxisomes contain oxidative enzymes that break down fatty acids and produce
hydrogen peroxide (H₂O₂), which is then broken down by catalase into water and oxygen. They
,are essential for lipid metabolism and detoxification.
🟢 Question 5: Which of the following correctly describes the function of ribosomes?
A) Lipid synthesis and detoxification
B) Protein synthesis by translating mRNA into polypeptide chains
C) Modification and packaging of proteins for secretion
D) Digestion of worn-out organelles and cellular debris
🔴 Correct Answer: B) Protein synthesis by translating mRNA into polypeptide chains
Rationale: Ribosomes are the sites of protein synthesis, where mRNA is translated into
polypeptide chains. They are composed of rRNA and proteins and can be free in the cytoplasm
or attached to rough ER.
🟢 Question 6: A cell that is actively secreting large amounts of protein would be expected to
have a high concentration of which organelle?
A) Smooth endoplasmic reticulum
B) Lysosomes
C) Rough endoplasmic reticulum and Golgi apparatus
D) Peroxisomes
🔴 Correct Answer: C) Rough endoplasmic reticulum and Golgi apparatus
Rationale: Cells that secrete proteins (e.g., plasma cells, pancreatic acinar cells) have extensive
rough ER for protein synthesis and Golgi apparatus for modification, packaging, and secretion
of proteins.
🟢 Question 7: The nucleolus is the site of:
A) DNA replication
B) mRNA synthesis
C) Ribosomal RNA (rRNA) synthesis and ribosome assembly
D) ATP production
🔴 Correct Answer: C) Ribosomal RNA (rRNA) synthesis and ribosome assembly
, Rationale: The nucleolus is a dense region within the nucleus where rRNA is synthesized and
combined with proteins to form ribosomal subunits. It does not synthesize mRNA or replicate
DNA.
🟢 Question 8: Which membrane-bound organelle contains hydrolytic enzymes and functions
as the "digestive system" of the cell?
A) Peroxisome
B) Lysosome
C) Endosome
D) Vacuole
🔴 Correct Answer: B) Lysosome
Rationale: Lysosomes are membrane-bound vesicles containing hydrolytic (digestive) enzymes
that break down macromolecules, worn-out organelles, and pathogens. They function in
intracellular digestion and autophagy.
🟢 Question 9: The nuclear envelope is perforated by structures that regulate the movement
of molecules between the nucleus and cytoplasm. These structures are called:
A) Nuclear pores
B) Gap junctions
C) Nucleoli
D) Chromatin
🔴 Correct Answer: A) Nuclear pores
Rationale: Nuclear pores are channels in the nuclear envelope that allow selective transport of
ions, small molecules, and macromolecules (such as mRNA and proteins) between the nucleus
and cytoplasm.
🟢 Question 10: Which of the following statements about the Golgi apparatus is FALSE?
A) It modifies proteins by adding carbohydrate groups (glycosylation)
B) It packages proteins into vesicles for transport
C) It synthesizes proteins from amino acids
