Foundations of Pathophysiology: Bridging
Cellular Homeostasis, Injury Mechanisms,
and Fluid-Electrolyte Dynamics – A High-
Yield Question Q&A for the 2026–2027
Advanced Practice Exam.
---
CHAPTER 1: Cellular Biology
**1. Which statement best describes the cellular function of metabolic
absorption?**
- A) Cells can produce proteins.
- B) Cells can secrete digestive enzymes.
- C) Cells can take in and use nutrients.
- D) Cells can synthesize fats.
**Answer: C** - In metabolic absorption, all cells take in and use nutrients and
other substances from their surroundings.
**Rationale:** Metabolic absorption is the process by which cells take in and
utilize nutrients from their environment. While cells do produce proteins, secrete
enzymes, and synthesize fats, these are separate cellular functions and do not
fully describe metabolic absorption.
,---
**2. Where is most of a cell's genetic information, including RNA and DNA,
contained?**
- A) Mitochondria
- B) Ribosome
- C) Nucleolus
- D) Lysosome
**Answer: C** - The nucleolus is a small dense structure composed largely of
RNA, most of the cellular DNA, and DNA-binding proteins such as histones that
regulate its activity.
**Rationale:** The nucleus contains the nucleolus, which houses the cell's
genetic material. Mitochondria are responsible for cellular respiration and energy
production. Ribosomes provide sites for protein synthesis. Lysosomes function as
the intracellular digestive system.
---
**3. Which component of the cell produces hydrogen peroxide (H₂O₂) by using
oxygen to remove hydrogen atoms from specific substrates in an oxidative
reaction?**
- A) Lysosomes
- B) Peroxisomes
- C) Ribosomes
,- D) Endosomes
**Answer: B** - Peroxisomes contain enzymes that use oxygen to remove
hydrogen atoms from specific substrates, producing H₂O₂.
**Rationale:** Peroxisomes are named for their production of hydrogen
peroxide, a powerful oxidant that can be destructive if it accumulates or escapes.
Ribosomes synthesize proteins, lysosomes contain digestive enzymes, and
endosomes are vesicles pinched off from the cellular membrane.
---
**4. Which cell component is capable of cellular autodigestion when released
during cell injury?**
- A) Ribosome
- B) Golgi complex
- C) Smooth endoplasmic reticulum
- D) Lysosomes
**Answer: D** - The lysosomal membrane protects the cytoplasm from powerful
digestive enzymes. Disruption of this membrane during cell injury leads to
enzyme release and cellular self-digestion.
**Rationale:** Lysosomes contain more than 40 digestive enzymes called
hydrolases. When released into the cytoplasm, these enzymes catalyze the
breakdown of proteins, lipids, nucleic acids, and carbohydrates, causing
autodigestion of the cell.
, ---
**5. Which cellular function involves the movement of molecules from an area of
higher concentration to an area of lower concentration without energy
expenditure?**
- A) Active transport
- B) Diffusion
- C) Phagocytosis
- D) Endocytosis
**Answer: B** - Diffusion is the passive movement of molecules or particles from
an area of higher concentration to an area of lower concentration.
**Rationale:** Diffusion is a passive transport mechanism that does not require
cellular energy (ATP). Active transport, phagocytosis, and endocytosis all require
energy expenditure by the cell.
---
**6. A cell that is actively synthesizing proteins will have a large number of which
organelle?**
- A) Mitochondria
- B) Lysosomes
- C) Ribosomes
- D) Golgi apparatus
Cellular Homeostasis, Injury Mechanisms,
and Fluid-Electrolyte Dynamics – A High-
Yield Question Q&A for the 2026–2027
Advanced Practice Exam.
---
CHAPTER 1: Cellular Biology
**1. Which statement best describes the cellular function of metabolic
absorption?**
- A) Cells can produce proteins.
- B) Cells can secrete digestive enzymes.
- C) Cells can take in and use nutrients.
- D) Cells can synthesize fats.
**Answer: C** - In metabolic absorption, all cells take in and use nutrients and
other substances from their surroundings.
**Rationale:** Metabolic absorption is the process by which cells take in and
utilize nutrients from their environment. While cells do produce proteins, secrete
enzymes, and synthesize fats, these are separate cellular functions and do not
fully describe metabolic absorption.
,---
**2. Where is most of a cell's genetic information, including RNA and DNA,
contained?**
- A) Mitochondria
- B) Ribosome
- C) Nucleolus
- D) Lysosome
**Answer: C** - The nucleolus is a small dense structure composed largely of
RNA, most of the cellular DNA, and DNA-binding proteins such as histones that
regulate its activity.
**Rationale:** The nucleus contains the nucleolus, which houses the cell's
genetic material. Mitochondria are responsible for cellular respiration and energy
production. Ribosomes provide sites for protein synthesis. Lysosomes function as
the intracellular digestive system.
---
**3. Which component of the cell produces hydrogen peroxide (H₂O₂) by using
oxygen to remove hydrogen atoms from specific substrates in an oxidative
reaction?**
- A) Lysosomes
- B) Peroxisomes
- C) Ribosomes
,- D) Endosomes
**Answer: B** - Peroxisomes contain enzymes that use oxygen to remove
hydrogen atoms from specific substrates, producing H₂O₂.
**Rationale:** Peroxisomes are named for their production of hydrogen
peroxide, a powerful oxidant that can be destructive if it accumulates or escapes.
Ribosomes synthesize proteins, lysosomes contain digestive enzymes, and
endosomes are vesicles pinched off from the cellular membrane.
---
**4. Which cell component is capable of cellular autodigestion when released
during cell injury?**
- A) Ribosome
- B) Golgi complex
- C) Smooth endoplasmic reticulum
- D) Lysosomes
**Answer: D** - The lysosomal membrane protects the cytoplasm from powerful
digestive enzymes. Disruption of this membrane during cell injury leads to
enzyme release and cellular self-digestion.
**Rationale:** Lysosomes contain more than 40 digestive enzymes called
hydrolases. When released into the cytoplasm, these enzymes catalyze the
breakdown of proteins, lipids, nucleic acids, and carbohydrates, causing
autodigestion of the cell.
, ---
**5. Which cellular function involves the movement of molecules from an area of
higher concentration to an area of lower concentration without energy
expenditure?**
- A) Active transport
- B) Diffusion
- C) Phagocytosis
- D) Endocytosis
**Answer: B** - Diffusion is the passive movement of molecules or particles from
an area of higher concentration to an area of lower concentration.
**Rationale:** Diffusion is a passive transport mechanism that does not require
cellular energy (ATP). Active transport, phagocytosis, and endocytosis all require
energy expenditure by the cell.
---
**6. A cell that is actively synthesizing proteins will have a large number of which
organelle?**
- A) Mitochondria
- B) Lysosomes
- C) Ribosomes
- D) Golgi apparatus
