NR 507 Exam 1: Advanced Pathophysiology V1 -
Chamberlain University Updated and Latest Questions and
Correct Answers with Rationale
1. Which process describes the decrease in cellular size caused by aging, disuse, or reduced blood supply?
A. Hypertrophy
B. Hyperplasia
C. Atrophy
D. Metaplasia
Ans: C
Explanation: Atrophy is a cellular adaptation characterized by a reduction in cell size to achieve a new
steady state. It often results from decreased workload, loss of innervation, or diminished blood flow. The
correct answer identifies this specific shrinking mechanism of the cell. In contrast, hypertrophy involves
an increase in size, while hyperplasia refers to an increase in number. Understanding atrophy is vital for
clinical assessments of muscle wasting and organ shrinkage.
2. What is the most common cause of cellular injury in clinical practice?
A. Chemical agents
B. Infectious agents
C. Hypoxia
D. Nutritional imbalances
Ans: C
Explanation: Hypoxia, or lack of sufficient oxygen, is the leading cause of cellular injury and death. It
typically stems from ischemia, which is the reduction of blood supply to tissues. The correct choice
,reflects the fundamental role of oxygen in ATP production and cell survival. While chemicals and
infections cause injury, they occur less frequently as primary causes compared to oxygen deprivation.
Recognizing hypoxia helps clinicians prioritize respiratory and cardiovascular interventions.
3. In DNA replication, which enzyme is responsible for untwisting the helical structure?
A. DNA helicase
B. RNA polymerase
C. DNA polymerase
D. Ligase
Ans: A
Explanation: DNA helicase is the essential enzyme that breaks hydrogen bonds to separate DNA strands.
This action creates the replication fork necessary for the synthesis of new strands. The correct answer
identifies the ‘unzipper’ of the genetic code during the S phase. DNA polymerase builds the new strand,
while ligase seals gaps between fragments. Mastering molecular biology concepts is necessary for
understanding genetic disorders and oncogenesis.
4. Which condition is characterized by a karyotype showing 45,X?
A. Turner Syndrome
B. Klinefelter Syndrome
C. Down Syndrome
D. Cri du Chat Syndrome
Ans: A
, Explanation: Turner Syndrome is a genetic condition where a female is partially or completely missing
an X chromosome. This monosomy leads to clinical features such as short stature and webbed neck. The
correct answer identifies the specific chromosomal configuration of 45,X. Klinefelter syndrome involves
an extra X in males (47,XXY), and Down syndrome is trisomy 21. Understanding karyotypes allows for
the diagnosis of complex congenital conditions.
5. What is the primary extracellular cation responsible for maintaining osmotic pressure?
A. Potassium
B. Sodium
C. Calcium
D. Magnesium
Ans: B
Explanation: Sodium is the most abundant cation in the extracellular fluid and dictates water movement.
It works alongside chloride to maintain the balance between intracellular and extracellular
compartments. The correct answer reflects sodium’s dominant role in regulating blood volume and
pressure. Potassium is the primary intracellular cation, making it the incorrect choice here. Monitoring
sodium levels is critical in managing dehydration and edema cases.
6. Metabolic acidosis is often compensated for by which physiological mechanism?
A. Kidney excretion of bicarbonate
B. Hyperventilation
C. Hypoventilation
D. Decrease in heart rate
Ans: B
Chamberlain University Updated and Latest Questions and
Correct Answers with Rationale
1. Which process describes the decrease in cellular size caused by aging, disuse, or reduced blood supply?
A. Hypertrophy
B. Hyperplasia
C. Atrophy
D. Metaplasia
Ans: C
Explanation: Atrophy is a cellular adaptation characterized by a reduction in cell size to achieve a new
steady state. It often results from decreased workload, loss of innervation, or diminished blood flow. The
correct answer identifies this specific shrinking mechanism of the cell. In contrast, hypertrophy involves
an increase in size, while hyperplasia refers to an increase in number. Understanding atrophy is vital for
clinical assessments of muscle wasting and organ shrinkage.
2. What is the most common cause of cellular injury in clinical practice?
A. Chemical agents
B. Infectious agents
C. Hypoxia
D. Nutritional imbalances
Ans: C
Explanation: Hypoxia, or lack of sufficient oxygen, is the leading cause of cellular injury and death. It
typically stems from ischemia, which is the reduction of blood supply to tissues. The correct choice
,reflects the fundamental role of oxygen in ATP production and cell survival. While chemicals and
infections cause injury, they occur less frequently as primary causes compared to oxygen deprivation.
Recognizing hypoxia helps clinicians prioritize respiratory and cardiovascular interventions.
3. In DNA replication, which enzyme is responsible for untwisting the helical structure?
A. DNA helicase
B. RNA polymerase
C. DNA polymerase
D. Ligase
Ans: A
Explanation: DNA helicase is the essential enzyme that breaks hydrogen bonds to separate DNA strands.
This action creates the replication fork necessary for the synthesis of new strands. The correct answer
identifies the ‘unzipper’ of the genetic code during the S phase. DNA polymerase builds the new strand,
while ligase seals gaps between fragments. Mastering molecular biology concepts is necessary for
understanding genetic disorders and oncogenesis.
4. Which condition is characterized by a karyotype showing 45,X?
A. Turner Syndrome
B. Klinefelter Syndrome
C. Down Syndrome
D. Cri du Chat Syndrome
Ans: A
, Explanation: Turner Syndrome is a genetic condition where a female is partially or completely missing
an X chromosome. This monosomy leads to clinical features such as short stature and webbed neck. The
correct answer identifies the specific chromosomal configuration of 45,X. Klinefelter syndrome involves
an extra X in males (47,XXY), and Down syndrome is trisomy 21. Understanding karyotypes allows for
the diagnosis of complex congenital conditions.
5. What is the primary extracellular cation responsible for maintaining osmotic pressure?
A. Potassium
B. Sodium
C. Calcium
D. Magnesium
Ans: B
Explanation: Sodium is the most abundant cation in the extracellular fluid and dictates water movement.
It works alongside chloride to maintain the balance between intracellular and extracellular
compartments. The correct answer reflects sodium’s dominant role in regulating blood volume and
pressure. Potassium is the primary intracellular cation, making it the incorrect choice here. Monitoring
sodium levels is critical in managing dehydration and edema cases.
6. Metabolic acidosis is often compensated for by which physiological mechanism?
A. Kidney excretion of bicarbonate
B. Hyperventilation
C. Hypoventilation
D. Decrease in heart rate
Ans: B
