,BIOL331/BIOL 331 Module 4
Pathophysiology | Portage |Q&A| 26/27
1. A researcher is studying the process by which all formed elements of blood originate from a single
precursor cell type. Which term describes this precursor?
A) Reticulocyte
B) Pluripotent stem cell
C) Megakaryocyte
D) Myeloblast
Correct Answer: Pluripotent stem cell
Rationale: Pluripotent stem cells in the bone marrow give rise to all formed elements of blood
through differentiation. Reticulocytes are immature red blood cells, megakaryocytes produce
platelets, and myeloblasts are committed precursors, making them incorrect for the original
precursor.
2. A cell biologist is examining a cell that has lost its nucleus and organelles to maximize space for
oxygen transport. Which cell type is being described?
A) Leukocyte
B) Thrombocyte
C) Erythrocyte
,D) Monocyte
Correct Answer: Erythrocyte
Rationale: Erythrocytes lose their nucleus and organelles during maturation to maximize hemoglobin
content for oxygen transport. Leukocytes are white blood cells with nuclei, thrombocytes are
platelets, and monocytes are a type of leukocyte, making them incorrect.
3. A patient with chronic kidney disease has decreased erythropoietin production. Which laboratory
finding is most likely?
A) Elevated hematocrit
B) Decreased red blood cell count
C) Elevated platelet count
D) Decreased white blood cell count
Correct Answer: Decreased red blood cell count
Rationale: Erythropoietin from the kidneys stimulates red blood cell production, so decreased
production leads to anemia. Elevated hematocrit would indicate polycythemia, and platelet and white
blood cell counts are not directly affected by erythropoietin, making them incorrect.
4. A patient with iron deficiency anemia has impaired oxygen transport. Which component of
hemoglobin is directly affected by iron deficiency?
A) Globin chains
B) Heme groups
, C) Cell membrane
D) Cytoskeleton
Correct Answer: Heme groups
Rationale: Iron is essential for heme synthesis, so iron deficiency impairs heme production and
subsequently hemoglobin synthesis. Globin chains are protein components, and cell membrane and
cytoskeleton are structural components not directly affected by iron, making them incorrect.
5. A patient with a folic acid deficiency has impaired red blood cell maturation. Which type of anemia
is most likely?
A) Microcytic anemia
B) Macrocytic anemia
C) Normocytic anemia
D) Hemolytic anemia
Correct Answer: Macrocytic anemia
Rationale: Folic acid deficiency impairs DNA synthesis, leading to large, immature red blood cells
(macrocytic anemia). Microcytic anemia is associated with iron deficiency, normocytic anemia with
chronic disease, and hemolytic anemia with red blood cell destruction, making them incorrect.
6. A patient with vitamin B12 deficiency develops neurologic symptoms in addition to anemia. Which
mechanism explains the neurologic findings?
Pathophysiology | Portage |Q&A| 26/27
1. A researcher is studying the process by which all formed elements of blood originate from a single
precursor cell type. Which term describes this precursor?
A) Reticulocyte
B) Pluripotent stem cell
C) Megakaryocyte
D) Myeloblast
Correct Answer: Pluripotent stem cell
Rationale: Pluripotent stem cells in the bone marrow give rise to all formed elements of blood
through differentiation. Reticulocytes are immature red blood cells, megakaryocytes produce
platelets, and myeloblasts are committed precursors, making them incorrect for the original
precursor.
2. A cell biologist is examining a cell that has lost its nucleus and organelles to maximize space for
oxygen transport. Which cell type is being described?
A) Leukocyte
B) Thrombocyte
C) Erythrocyte
,D) Monocyte
Correct Answer: Erythrocyte
Rationale: Erythrocytes lose their nucleus and organelles during maturation to maximize hemoglobin
content for oxygen transport. Leukocytes are white blood cells with nuclei, thrombocytes are
platelets, and monocytes are a type of leukocyte, making them incorrect.
3. A patient with chronic kidney disease has decreased erythropoietin production. Which laboratory
finding is most likely?
A) Elevated hematocrit
B) Decreased red blood cell count
C) Elevated platelet count
D) Decreased white blood cell count
Correct Answer: Decreased red blood cell count
Rationale: Erythropoietin from the kidneys stimulates red blood cell production, so decreased
production leads to anemia. Elevated hematocrit would indicate polycythemia, and platelet and white
blood cell counts are not directly affected by erythropoietin, making them incorrect.
4. A patient with iron deficiency anemia has impaired oxygen transport. Which component of
hemoglobin is directly affected by iron deficiency?
A) Globin chains
B) Heme groups
, C) Cell membrane
D) Cytoskeleton
Correct Answer: Heme groups
Rationale: Iron is essential for heme synthesis, so iron deficiency impairs heme production and
subsequently hemoglobin synthesis. Globin chains are protein components, and cell membrane and
cytoskeleton are structural components not directly affected by iron, making them incorrect.
5. A patient with a folic acid deficiency has impaired red blood cell maturation. Which type of anemia
is most likely?
A) Microcytic anemia
B) Macrocytic anemia
C) Normocytic anemia
D) Hemolytic anemia
Correct Answer: Macrocytic anemia
Rationale: Folic acid deficiency impairs DNA synthesis, leading to large, immature red blood cells
(macrocytic anemia). Microcytic anemia is associated with iron deficiency, normocytic anemia with
chronic disease, and hemolytic anemia with red blood cell destruction, making them incorrect.
6. A patient with vitamin B12 deficiency develops neurologic symptoms in addition to anemia. Which
mechanism explains the neurologic findings?
