Page 1 of 68
EXAM 1 NR 545 UPDATED ACTUAL EXAM LATEST 2026 – 2027
VERSION SOLVED QUESTIONS & ANSWERS
EXAM 1 NR 545 UPDATED ACTUAL EXAM - 250 Questions with Rationales
QUESTIONS 1-250
SECTION 1: Cellular Pathophysiology & Foundational Concepts (Questions 1-30)
1. What is metabolic absorption at the cellular level?
A) The process by which cells convert ATP into nutrients
B) The process by which nutrients are absorbed into cells and converted into ATP
C) The process by which cells release waste products
D) The process by which cells communicate with neighboring cells
Answer: B
Rationale: Metabolic absorption is the process by which nutrients are absorbed into
cells and converted into ATP, providing energy for cellular functions. This is a
fundamental cellular process that supports all metabolic activities .
2. Which organelle uses oxygen to remove hydrogen atoms in oxidative reactions,
producing hydrogen peroxide?
A) Lysosomes
B) Mitochondria
C) Peroxisomes
D) Ribosomes
Answer: C
Rationale: Peroxisomes use oxygen to remove hydrogen atoms in oxidative reactions,
producing hydrogen peroxide, which is then broken down by catalase. This function is
essential for cellular metabolism and protection against oxidative stress .
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3. During cell injury, which organelle releases enzymes capable of cellular
autodigestion?
A) Peroxisomes
B) Mitochondria
C) Lysosomes
D) Ribosomes
Answer: C
Rationale: Lysosomes contain hydrolytic enzymes capable of cellular autodigestion.
When released during cell injury, these enzymes can break down cellular components,
contributing to cell death. This is a key mechanism in various pathological processes .
4. Where is the genetic information of the cell contained?
A) Mitochondria
B) Cytoplasm
C) Ribosomes
D) Nucleolus/Nucleus
Answer: D
Rationale: The genetic information of the cell is contained within the nucleus and
nucleolus. The nucleus houses DNA, while the nucleolus is responsible for ribosomal
RNA synthesis. This is the control center for cellular activities .
5. Cell membranes are composed primarily of which major chemical components?
A) Lipids and carbohydrates
B) Lipids and proteins
C) Proteins and carbohydrates
D) Nucleic acids and lipids
Answer: B
Rationale: Cell membranes are composed primarily of a lipid bilayer with proteins
embedded within. The membrane consists of hydrophobic and hydrophilic regions,
forming an amphipathic structure that regulates passage of substances .
6. What maintains the electrochemical gradient across the cell membrane,
allowing potassium to diffuse in and out of cells?
, Page 3 of 68
A) Passive transport channels
B) Sodium-potassium pump
C) Osmosis
D) Diffusion
Answer: B
Rationale: The sodium-potassium pump is powered by ATP and moves 3 sodium ions
out of the cell while bringing 2 potassium ions inside. This pump maintains the
electrochemical gradient essential for cellular function .
7. When the Na-K pump fails due to lack of ATP (as in ischemia), what occurs?
A) Sodium and potassium levels remain balanced
B) Sodium and calcium accumulate inside the cell, causing cellular swelling
C) The cell shrinks due to water loss
D) ATP production increases
Answer: B
Rationale: When the Na-K pump fails due to lack of ATP, sodium and calcium
accumulate inside the cell, and water follows by osmosis, causing cellular swelling.
This also causes dilation of the endoplasmic reticulum, leading to decreased protein
synthesis .
8. What are free radicals in relation to cell damage?
A) Cells with no nucleus
B) Molecules with a single unpaired electron that initiate chain reactions
C) Proteins that repair damaged DNA
D) Lipids that protect cell membranes
Answer: B
Rationale: Free radicals are molecular species capable of independent existence with
a single unpaired electron in the outer orbit. This makes them unstable and reactive,
initiating chain reactions that create more free radicals and cause cellular damage .
9. In cirrhosis, what happens to cholesterol in erythrocytes?
A) Decreases relative to phospholipid
B) Increases relative to phospholipid
C) Remains unchanged
D) Becomes completely absent
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Answer: B
Rationale: In cirrhosis, cholesterol increases relative to phospholipid in erythrocytes,
altering membrane properties. This contributes to abnormal red blood cell morphology
and function in liver disease .
10. What is the relationship between ischemia and ATP?
A) Ischemia increases ATP production
B) Ischemia causes a rapid decrease in mitochondrial phosphorylation and decreased
ATP
C) Ischemia has no effect on ATP
D) Ischemia converts ATP to ADP
Answer: B
Rationale: When ischemia occurs, there is a rapid decrease in mitochondrial
phosphorylation, resulting in decreased ATP production. This energy deficit leads to
cellular dysfunction and injury .
11. How does lead poisoning cause damage within the cell?
A) By directly destroying the nucleus
B) By altering intracellular calcium concentration and interfering with transport proteins
C) By blocking DNA replication
D) By inhibiting protein synthesis only
Answer: B
Rationale: Lead poisoning causes cellular damage by altering intracellular calcium
concentration and interfering with transport proteins. This disrupts normal cellular
function and contributes to the clinical manifestations of lead toxicity .
12. The primary focus of NR 545 is:
A) Basic nursing skills and fundamentals
B) Advanced nursing practices with emphasis on integrating evidence-based research
into clinical decision-making
C) Medical-surgical nursing techniques
D) Nursing administration and leadership
Answer: B
Rationale: The primary focus of NR 545 is advanced nursing practices with an
EXAM 1 NR 545 UPDATED ACTUAL EXAM LATEST 2026 – 2027
VERSION SOLVED QUESTIONS & ANSWERS
EXAM 1 NR 545 UPDATED ACTUAL EXAM - 250 Questions with Rationales
QUESTIONS 1-250
SECTION 1: Cellular Pathophysiology & Foundational Concepts (Questions 1-30)
1. What is metabolic absorption at the cellular level?
A) The process by which cells convert ATP into nutrients
B) The process by which nutrients are absorbed into cells and converted into ATP
C) The process by which cells release waste products
D) The process by which cells communicate with neighboring cells
Answer: B
Rationale: Metabolic absorption is the process by which nutrients are absorbed into
cells and converted into ATP, providing energy for cellular functions. This is a
fundamental cellular process that supports all metabolic activities .
2. Which organelle uses oxygen to remove hydrogen atoms in oxidative reactions,
producing hydrogen peroxide?
A) Lysosomes
B) Mitochondria
C) Peroxisomes
D) Ribosomes
Answer: C
Rationale: Peroxisomes use oxygen to remove hydrogen atoms in oxidative reactions,
producing hydrogen peroxide, which is then broken down by catalase. This function is
essential for cellular metabolism and protection against oxidative stress .
, Page 2 of 68
3. During cell injury, which organelle releases enzymes capable of cellular
autodigestion?
A) Peroxisomes
B) Mitochondria
C) Lysosomes
D) Ribosomes
Answer: C
Rationale: Lysosomes contain hydrolytic enzymes capable of cellular autodigestion.
When released during cell injury, these enzymes can break down cellular components,
contributing to cell death. This is a key mechanism in various pathological processes .
4. Where is the genetic information of the cell contained?
A) Mitochondria
B) Cytoplasm
C) Ribosomes
D) Nucleolus/Nucleus
Answer: D
Rationale: The genetic information of the cell is contained within the nucleus and
nucleolus. The nucleus houses DNA, while the nucleolus is responsible for ribosomal
RNA synthesis. This is the control center for cellular activities .
5. Cell membranes are composed primarily of which major chemical components?
A) Lipids and carbohydrates
B) Lipids and proteins
C) Proteins and carbohydrates
D) Nucleic acids and lipids
Answer: B
Rationale: Cell membranes are composed primarily of a lipid bilayer with proteins
embedded within. The membrane consists of hydrophobic and hydrophilic regions,
forming an amphipathic structure that regulates passage of substances .
6. What maintains the electrochemical gradient across the cell membrane,
allowing potassium to diffuse in and out of cells?
, Page 3 of 68
A) Passive transport channels
B) Sodium-potassium pump
C) Osmosis
D) Diffusion
Answer: B
Rationale: The sodium-potassium pump is powered by ATP and moves 3 sodium ions
out of the cell while bringing 2 potassium ions inside. This pump maintains the
electrochemical gradient essential for cellular function .
7. When the Na-K pump fails due to lack of ATP (as in ischemia), what occurs?
A) Sodium and potassium levels remain balanced
B) Sodium and calcium accumulate inside the cell, causing cellular swelling
C) The cell shrinks due to water loss
D) ATP production increases
Answer: B
Rationale: When the Na-K pump fails due to lack of ATP, sodium and calcium
accumulate inside the cell, and water follows by osmosis, causing cellular swelling.
This also causes dilation of the endoplasmic reticulum, leading to decreased protein
synthesis .
8. What are free radicals in relation to cell damage?
A) Cells with no nucleus
B) Molecules with a single unpaired electron that initiate chain reactions
C) Proteins that repair damaged DNA
D) Lipids that protect cell membranes
Answer: B
Rationale: Free radicals are molecular species capable of independent existence with
a single unpaired electron in the outer orbit. This makes them unstable and reactive,
initiating chain reactions that create more free radicals and cause cellular damage .
9. In cirrhosis, what happens to cholesterol in erythrocytes?
A) Decreases relative to phospholipid
B) Increases relative to phospholipid
C) Remains unchanged
D) Becomes completely absent
, Page 4 of 68
Answer: B
Rationale: In cirrhosis, cholesterol increases relative to phospholipid in erythrocytes,
altering membrane properties. This contributes to abnormal red blood cell morphology
and function in liver disease .
10. What is the relationship between ischemia and ATP?
A) Ischemia increases ATP production
B) Ischemia causes a rapid decrease in mitochondrial phosphorylation and decreased
ATP
C) Ischemia has no effect on ATP
D) Ischemia converts ATP to ADP
Answer: B
Rationale: When ischemia occurs, there is a rapid decrease in mitochondrial
phosphorylation, resulting in decreased ATP production. This energy deficit leads to
cellular dysfunction and injury .
11. How does lead poisoning cause damage within the cell?
A) By directly destroying the nucleus
B) By altering intracellular calcium concentration and interfering with transport proteins
C) By blocking DNA replication
D) By inhibiting protein synthesis only
Answer: B
Rationale: Lead poisoning causes cellular damage by altering intracellular calcium
concentration and interfering with transport proteins. This disrupts normal cellular
function and contributes to the clinical manifestations of lead toxicity .
12. The primary focus of NR 545 is:
A) Basic nursing skills and fundamentals
B) Advanced nursing practices with emphasis on integrating evidence-based research
into clinical decision-making
C) Medical-surgical nursing techniques
D) Nursing administration and leadership
Answer: B
Rationale: The primary focus of NR 545 is advanced nursing practices with an
