General Pathology Practice Questions

Q: Apoptosis is characterized by all of the following except which of the following?

Cell proliferation. ***Inflammation*** - Apoptosis is a programmed cell death process that **does not induce inflammation**, contrasting with necrosis, which does [1]. - It is characterized by its **clean uptake** by surrounding cells without eliciting an immune response [1]. *DNA fragmentation* - A hallmark of apoptosis, where **DNA is cleaved** into smaller fragments as part of the intrinsic cell death pathway [2]. - This fragmentation can be detected via techniques such as **agarose gel electrophoresis**. *Cell shrinkage* - In apoptosis, cells exhibit **shrinkage**, also known as **pyknosis**, as they lose their volume and adopt a condensed morphology. - This shrinkage is due to changes in the cytoskeleton and loss of intracellular water. *Chromatin condensation* - One of the early features of apoptosis is **chromatin condensation**, which leads to the formation of dense nuclear material [3]. - This process is part of the typical morphology seen during programmed cell death. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Cellular Responses to Stress and Toxic Insults: Adaptation, Injury, and Death, pp. 67-69. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Cellular Responses to Stress and Toxic Insults: Adaptation, Injury, and Death, pp. 64-65. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 80-81.

Q: Lipid peroxidation is a cause of aging and injury to cells. This statement is explained by which theory?

Free radical theory. ***Free radical theory*** - The **free radical theory of aging** suggests that accumulated **lipid peroxidation** by-products contribute significantly to cellular damage and aging [1][2]. - Reactive oxygen species (ROS) can damage biomolecules, leading to cell death and dysfunction, closely linking it to the aging process [2]. *Enzyme cascade theory* - This theory relates to **signal transduction** and **enzymatic reactions** rather than directly linking to **lipid peroxidation** and cellular injury. - It does not significantly explain the oxidative stress phenomenon or its impact on aging. *Apoptosis theory* - Focuses on **programmed cell death** as a mechanism for aging but does not specifically account for the role of **lipid peroxidation**. - While apoptosis is a process related to aging, it is not the primary cause of cellular injury associated with free radicals. *Cell destruction theory* - This theory broadly discusses cell loss but lacks a direct connection to the mechanisms of **lipid peroxidation** and oxidative damage. - It does not encompass the **biochemical processes** involving free radicals known to accelerate aging. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 100-101. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Cellular Responses to Stress and Toxic Insults: Adaptation, Injury, and Death, pp. 59-60.

Q: Among the following components of cigarette smoke, which is most directly associated with an increased risk of coronary artery disease?

Carbon monoxide. ***Carbon monoxide*** - **Carbon monoxide (CO)** is the cigarette smoke component most directly associated with coronary artery disease through formation of **carboxyhemoglobin (COHb)** [1]. - CO has **200-250 times higher affinity** for hemoglobin than oxygen, significantly reducing **oxygen delivery** to the myocardium and causing **tissue hypoxia** [1], [3]. *Nicotine* - While nicotine has important cardiovascular effects including **vasoconstriction** and **increased heart rate**, its association with coronary artery disease is less direct than CO's immediate impact on oxygen delivery. [2] - Nicotine promotes **platelet aggregation** and **endothelial dysfunction**, but these effects are secondary to CO's direct impact on **myocardial oxygenation**. *Tar* - **Tar** contains numerous **carcinogens** and irritants primarily linked to **lung cancer** and **COPD**, with more indirect cardiovascular effects through systemic inflammation. - While it contributes to **oxidative stress**, its association with coronary artery disease is significantly less direct than CO's immediate hemodynamic effects. *Polycyclic aromatic hydrocarbons* - **PAHs** are potent **carcinogens** with indirect cardiovascular impact through **oxidative stress** and **inflammation**, but not directly affecting coronary circulation like CO. - Their primary toxicity involves **DNA damage** and **cellular mutagenesis**, making their coronary disease association largely indirect and chronic.

Q: Which of the following is the characteristic of irreversible injury on electron microscopy?

Amorphous densities in mitochondria. ***Amorphous densities in mitochondria*** - Characteristic of irreversible injury, indicating **mitochondrial damage** and dysfunction [1]. - Presence of **electron-dense** deposits suggests cell death processes [1]. *Disruption of ribosomes* - Ribosomal disruption is more associated with **reversible injury**, not a definitive indicator of irreversible changes. - Typically, it occurs in response to **cell stress**, which may not lead to cell death. *Swelling of Endoplasmic reticulum* - Endoplasmic reticulum swelling is indicative of **cellular stress** but is often a feature of **reversible injury** rather than irreversible. - It reflects an adaptation to stress rather than definitive cell death. *Cell swelling* - Cell swelling indicates early **reversible injury** as cells attempt to maintain homeostasis. - Typically seen in initial stages of injury, it does not indicate irreversible damage. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Cellular Responses to Stress and Toxic Insults: Adaptation, Injury, and Death, pp. 53-55.

Q: Which of the following conditions does not typically cause an increase in alpha-fetoprotein (AFP)?

Bronchial aplasia. ***Bronchial aplasia*** - **Bronchial aplasia** is a rare congenital malformation of the respiratory system and does not typically involve the production or release of AFP. - This condition is characterized by the **absence or hypoplasia of a bronchus** and is not associated with the embryonic tissues responsible for AFP synthesis. *Open spina bifida* - **Open neural tube defects** like spina bifida lead to leakage of AFP from the fetal cerebrospinal fluid into the amniotic fluid and maternal circulation. - This leakage results in significantly **elevated levels of AFP**, making it a key diagnostic marker. *Endodermal sinus tumor* - **Endodermal sinus tumors**, also known as yolk sac tumors, are malignant germ cell tumors that produce copious amounts of **alpha-fetoprotein (AFP)**. - These tumors mimic the embryonic yolk sac, which is a primary site of AFP synthesis during fetal development. *Dysgerminoma* - **Dysgerminoma** is a germ cell tumor that typically does *not* produce AFP; instead, it is often associated with elevated levels of **lactate dehydrogenase (LDH)** and **human chorionic gonadotropin (hCG)** in some cases. - While AFP can be mildly elevated in mixed germ cell tumors containing dysgerminoma components, pure dysgerminoma is not a primary source of AFP production.

Q: Splenic macrophages in Gaucher's disease differ from those in ceroid histiocytosis by staining positive for which of the following?

PAS (Periodic Acid-Schiff). ***Lipids*** - In Gaucher's disease, splenic macrophages (Gaucher cells) show a characteristic **accumulation of lipids** due to glucocerebrosidase deficiency [1]. - They stain positively for **lipid materials**, which is a key distinguishing feature from ceroid histiocytosis [1]. *Iron* - Staining for **iron** is characteristic of hemosiderin deposition, which is not a feature of Gaucher's disease macrophages. - **Ceroid histiocytosis** typically involves iron accumulation, not lipid accumulation. *Acid fast stain* - An **acid-fast stain** is used to identify mycobacterial infections, which is not relevant to Gaucher's disease or its macrophages. - This stain does not indicate lipid storage, making it unsuitable for differentiating Gaucher's disease. *Phospholipids* - While **phospholipids** are components of cellular membranes, they do not specifically accumulate in Gaucher's disease like the derived lipids do. - Gaucher's disease is primarily characterized by the presence of **glucocerebroside**, rather than phospholipids [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Genetic Disorders, pp. 162-163.

Q: Which of the following is the most frequent site of thrombus?

Veins of lower extremities. The veins of the **lower extremities** are the most common site for thrombus formation, particularly due to **stasis** during prolonged immobility or conditions like **deep vein thrombosis (DVT)** [1]. These veins are often affected by a combination of factors including **venous stasis**, **endothelial injury**, and **hypercoagulability** (Virchow's triad). *Pulmonary vein* - While thrombosis can occur here, it is primarily associated with **pulmonary embolism** rather than being a primary site of thrombus formation. - Most thrombi in the pulmonary vein originate from **deep veins** in the legs during migration [1]. *Portal vein* - Thrombus formation in the **portal vein** is less common and often associated with specific conditions such as **cirrhosis**, **hypercoagulable states**, or **abdominal infections**. - The frequency of thrombus formation here is lower compared to the **lower extremity veins**. *Hepatic vein* - Hepatic vein thrombosis, also known as **Budd-Chiari syndrome**, is a rare condition and occurs under special circumstances like **liver disease** or **coagulopathy** [1]. - This is not a frequent site compared to the **lower extremities**, where thrombus formation happens much more commonly.

Q: What is hyperplasia?

Increase in cell number. ***Increase in cell size*** - Refers to the condition where individual **cells enlarge**, which is more accurately termed **hypertrophy**, not hyperplasia [1]. - **Hyperplasia** actually pertains to an increase in the **number of cells** due to cellular division [1]. *Decrease in cell number* - This indicates **atrophy**, which is the process of cell number reduction rather than an increase. - Hyperplasia is specifically defined by an **increase**, not a decrease, in cells [1]. *Decrease in cell size* - This also describes **atrophy**, marking a reduction in cell size rather than representing hyperplasia. - Hyperplasia involves an **increase** in the quantity of cells, not a decrease in size [1]. *Increase in cell number* - This is the correct definition of **hyperplasia** [1]; however, it was incorrectly matched to an increase in size in this context. - Hyperplasia is characterized by **increased cellular proliferation** rather than merely the size of existing cells [1]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 85-88.

Q: Which organ is least commonly affected by arterial thromboembolism?

Liver. ***Liver*** - The liver has a **dual blood supply** from both the **hepatic artery** and the **portal vein**, providing a significant compensatory mechanism against arterial occlusion. - This dual supply makes the liver highly **resistant to ischemia** from arterial thromboembolism, meaning it is less commonly affected compared to other organs. *Kidney* - The kidney is commonly affected by arterial thromboembolism due to its **end-arterial circulation** and a high proportion of **blood flow** from the aorta. - Renal arterial occlusion can rapidly lead to **renal infarcts** and acute kidney injury. *Heart* - The heart is frequently affected by arterial thromboembolism, particularly within the **coronary arteries**, leading to **myocardial infarction**. - This is a primary cause of cardiovascular morbidity and mortality. *Brain* - The brain is highly susceptible to arterial thromboembolism, leading to **ischemic stroke**, a common and devastating condition. - Emboli originating from the heart or carotid arteries frequently travel to the **cerebral circulation**, causing neurological deficits.

Q: Which adhesion molecule is involved in morphogenesis?

Tenascin. ***Tenascin*** - **Tenascin** is an extracellular matrix glycoprotein that plays a crucial role in various developmental processes, including **morphogenesis**. - It influences cell adhesion, migration, and differentiation, which are all fundamental to the proper formation of tissues and organs during development. *Osteopontin* - **Osteopontin** is primarily involved in bone mineralization, cell adhesion, and immune responses. - While it has adhesive properties, its main role is not central to the broad process of **morphogenesis**. *Osteonectin SPARC* - **Osteonectin (SPARC)** is a matricellular protein involved in tissue remodeling, cell proliferation, and angiogenesis. - While important in various biological processes, it is not primarily recognized as a key player in the direct adhesive mechanisms driving **morphogenesis**. *Thrombospondin* - **Thrombospondin** is a family of matricellular proteins involved in angiogenesis, inflammation, and wound healing. - Its adhesive properties are more focused on platelet aggregation and cell-matrix interactions in tissue repair rather than the orchestrating events of **morphogenesis**.

Question 1

Apoptosis is characterized by all of the following except which of the following?

Accepted Answer

Cell proliferation

Answer

Chromatin condensation

Answer

Cell shrinkage

Answer

DNA fragmentation

Question 2

Lipid peroxidation is a cause of aging and injury to cells. This statement is explained by which theory?

Accepted Answer

Free radical theory

Answer

Apoptosis theory

Answer

Enzyme cascade theory

Answer

Cell destruction theory

Question 3

Among the following components of cigarette smoke, which is most directly associated with an increased risk of coronary artery disease?

Accepted Answer

Carbon monoxide

Answer

Tar

Answer

Polycyclic aromatic hydrocarbons

Answer

Nicotine

Question 4

Which of the following is the characteristic of irreversible injury on electron microscopy?

Accepted Answer

Amorphous densities in mitochondria

Answer

Cell swelling

Answer

Disruption of ribosomes

Answer

Swelling of Endoplasmic reticulum

Question 5

Which of the following conditions does not typically cause an increase in alpha-fetoprotein (AFP)?

Accepted Answer

Bronchial aplasia

Answer

Endodermal sinus tumor

Answer

Open spina bifida

Answer

Dysgerminoma

Question 6

Splenic macrophages in Gaucher's disease differ from those in ceroid histiocytosis by staining positive for which of the following?

Accepted Answer

PAS (Periodic Acid-Schiff)

Answer

Iron

Answer

Glucocerebrosides

Answer

Acid-fast stain

Question 7

Which of the following is the most frequent site of thrombus?

Accepted Answer

Veins of lower extremities

Answer

Portal vein

Answer

Pulmonary vein

Answer

Hepatic vein

Question 8

What is hyperplasia?

Accepted Answer

Increase in cell number

Answer

Decrease in cell size

Answer

Increase in cell size

Answer

Replacement of one cell type by another

Question 9

Which organ is least commonly affected by arterial thromboembolism?

Accepted Answer

Liver

Answer

Kidney

Answer

Brain

Answer

Heart

Question 10

Which adhesion molecule is involved in morphogenesis?

Accepted Answer

Tenascin

Answer

Osteopontin

Answer

Osteonectin SPARC

Answer

Thrombospondin

General Pathology — MCQs

General Pathology — MCQs

On this page

Practice by Chapter

Want unlimited practice?