General Pathology Practice Questions

Q: What is the primary function of CD-95?

Inducing apoptosis. ***Apoptosis*** - CD-95, also known as **Fas receptor**, is a key mediator in the **apoptotic** pathway [1], triggering programmed cell death. - Its activation leads to a cascade of events that culminate in **cellular dismantling** and removal without inflammation [2]. *Cell necrosis* - Necrosis is associated with **uncontrolled cell death** resulting from conditions like **ischemia** or **toxins**, not regulated mechanisms like apoptosis. - It leads to a **pro-inflammatory response** due to cell rupture, contrasting with the clean process of apoptosis mediated by CD-95. *Proteolysis* - Proteolysis refers to the breakdown of **proteins** into smaller peptides or amino acids, which is unrelated to CD-95's function. - This process is primarily involved in **protein turnover** and degradation, not in inducing **apoptotic** signaling. *Interferon activation* - Interferons are molecules that play a role in **viral defense** and **immune modulation**, not directly associated with the apoptosis signaling pathway of CD-95. - Their functions include **antiviral activities** and stimulating immune responses, whereas CD-95 primarily signals for programmed cell death [3]. **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, p. 67. [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] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, p. 310.

Q: Which of the following organs typically develops red infarcts due to dual blood supply?

Lung. ***Lung*** - Red infarcts, characterized by their **hemorrhagic appearance**, often occur in organs like the lung due to their **dual blood supply** (bronchial and pulmonary arteries) and the presence of **venous obstruction** [1]. - This type of infarct is formed due to the inability to drain the blood appropriately, leading to **blood pooling** in infarcted areas [1]. *Spleen* - The spleen typically undergoes **white infarcts** due to its **end-arterial blood supply**, meaning it has only one arterial source, leading to necrosis without significant hemorrhage [1]. - Infarction in the spleen often presents as **firm and pale**, contrasting with the red nature of lung infarcts [1]. *Kidney* - The kidney also exhibits **white infarcts** due to its **segmental arteries**, resulting in necrosis without hemorrhage when blood flow is disrupted [1]. - The kidney infarcts result in **pale areas of necrosis**, again different from the vascular characteristics of lung infarcts [1]. *Heart* - Heart infarcts typically manifest as **transmural or subendocardial infarctions** which can lead to ischemic heart disease but do not classically present as red infarcts [1]. - They are usually **pale** in appearance initially due to interrupted blood supply from the coronary arteries, lacking the characteristics of red lung infarcts [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Hemodynamic Disorders, Thromboembolic Disease, and Shock, p. 140.

Q: Hypercoagulability due to a defective factor V gene is called:

Leiden mutation. ***Leiden mutation*** - The **Leiden mutation** refers specifically to a mutation in the **factor V gene** that leads to a hypercoagulable state, particularly increasing the risk of venous thromboembolism [1]. - It causes resistance to **activated protein C**, which normally regulates blood clotting, thus contributing to sustained clot formation [1]. *Lisbon mutation* - The **Lisbon mutation** is not a recognized term in the context of coagulation disorders or factor V. - There is no clinical relevance tied to clotting abnormalities related specifically to this mutation in the scientific literature. *Antiphospholipid syndrome* - Antiphospholipid syndrome is an autoimmune disorder characterized by **thrombosis** and pregnancy complications, but not specifically linked to the **factor V gene**. - It involves antibodies against phospholipids, which is unrelated to the genetic mutations affecting factor V. *Inducible thrombocytopenia syndrome* - This syndrome primarily involves **low platelet counts** induced by certain medications or conditions, not a defect in **factor V**. - It does not relate to hypercoagulability but rather to bleeding risks due to the **decreased platelet count**. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Hemodynamic Disorders, Thromboembolic Disease, and Shock, pp. 133-134.

Q: Which of the following conditions is primarily associated with stasis as a cause of thrombosis?

Venous stasis. ***All of the above*** - Stasis can contribute to **thrombosis in various conditions**, including polycythemia, as it increases blood viscosity, and in sickle cell anemia due to impaired blood flow [2]. - **Venous circulation** is particularly affected by stasis, as it leads to venous thromboembolism, making it a critical factor in thrombosis [1]. *Polycythemia* - While **polycythemia** leads to increased blood viscosity, stasis itself isn't the primary mechanism for thrombosis in this condition. - Thrombosis in polycythemia is more due to *hyperviscosity* rather than stasis alone. *Venous circulation* - While stasis is indeed significant in **venous circulation**, it does not capture the full spectrum of thrombosis causes in the context of various conditions [1]. - Other factors such as **hypercoagulability** and **vascular injury** also contribute, making it not solely reliant on stasis [1]. *Sickle cell Anemia* - Thrombosis in sickle cell anemia occurs mainly due to **occlusion** from sickled cells, rather than stasis leading to thrombus formation [2]. - While stasis can occur, it is not the principal cause of thrombosis in this disease [2].

Q: Who is credited with the introduction of electron microscopy?

Ruska. ***Ruska*** - **Ernst Ruska** was a German electrical engineer and Nobel laureate who, along with Max Knoll, is credited with the invention of the **electron microscope** in 1931. - His work was pivotal in developing a microscope that uses a beam of electrons to illuminate a specimen and create a magnified image, allowing for much higher resolution than light microscopes. *Leeuwenhoek* - **Antonie van Leeuwenhoek** is known for his pioneering work in microscopy and for significantly improving the simple microscope in the 17th century. - He is often referred to as the "Father of Microbiology" for his observations of microorganisms, but he did not invent the electron microscope. *Robert Koch* - **Robert Koch** was a German physician and microbiologist who is largely recognized for his role in identifying the specific causative agents of infectious diseases. - He developed Koch's postulates and made significant discoveries related to anthrax, tuberculosis, and cholera, but he was not involved in the development of electron microscopy. *Paul Ehrlich* - **Paul Ehrlich** was a German physician and scientist who worked in the fields of hematology, immunology, and chemotherapy. - He is known for his contributions to immunology, his discovery of the first effective treatment for syphilis, and coining the term "chemotherapy," but not for electron microscopy.

Q: Cause of nephrocalcinosis in granulomatous diseases is?

Increased conversion to 1,25 OH. ***Increased absorption*** - Granulomatous diseases, like sarcoidosis, lead to increased **vitamin D** absorption, causing hypercalcemia and subsequently **nephrocalcinosis**. [4] - This mechanism results from the conversion of inactive vitamin D to its active form, increasing calcium mobilization from the gut. [3], [4] *Dystrophic calcification* - Refers to calcium deposition in **damaged tissues**, typically not related to the increased absorption of calcium in nephrocalcinosis. - It usually occurs in areas with preceding tissue necrosis, rather than the increased calcium absorption seen in granulomatous diseases. *Increased conversion to 1,25 OH* - Although **increased conversion** of vitamin D occurs, it is not the primary reason for nephrocalcinosis; rather, it's the secondary effect of **increased absorption** that leads to calcium overload. [3], [4] - The relationship is more about the resultant increased calcium levels causing kidney damage rather than a direct causative effect. *Mutation in calcium sensing receptor* - This mutation typically causes **primary hyperparathyroidism** or other calcium dysregulations, but it is unrelated to the mechanism of nephrocalcinosis in **granulomatous diseases**. [1], [2] - Granulomatous nephrocalcinosis is more about excess calcium due to absorption rather than receptor malfunctioning.

Q: Coagulative necrosis is due to which of the following?

Denaturation of protein. ***Denaturation of protein*** - Coagulative necrosis primarily results from the **denaturation of proteins** within cells, which leads to cell membrane stability loss [1]. - Commonly associated with **ischemia** or **hypoxia**, causing localized tissue damage while preserving the basic structure of the necrotic tissue [1]. *Infection* - Infection can lead to **other forms of necrosis** such as liquefactive necrosis, but **not coagulative necrosis** directly. - Typically involves microbial agents that induce inflammation, instead of mere protein denaturation. *Enzymatic digestion* - Enzymatic digestion is characteristic of **liquefactive necrosis** where **enzymes degrade cellular structures**, leading to a liquid mass. - This process is not relevant to coagulative necrosis, which is marked by solid tissue with preserved outlines. *None* - The statement "None" doesn't accurately reflect the mechanism of coagulative necrosis, which **specifically involves protein denaturation**. - This oes not acknowledge the pathogenic factors involved in coagulative necrosis. **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: Caseous necrosis is typically associated with which of the following conditions?

Tuberculosis. ***Tuberculosis*** - **Caseous necrosis** is the hallmark of **tuberculosis**, often described as having a "cottage cheese-like" appearance [1]. - This type of necrosis is characteristic of the **granulomas** formed in bacterial infections, especially by *Mycobacterium tuberculosis* [1]. *Lymphogranuloma venereum* - This sexually transmitted infection, caused by *Chlamydia trachomatis* serovars L1, L2, or L3, leads to **suppurative necrosis** in lymph nodes, characterized by stellate abscesses. - The necrosis seen is typically **liquefactive** and purulent, not caseous. *Cytomegalovirus infection* - CMV infection can cause various histological changes, including **cytomegalic inclusions** and necrosis, but it is not typically associated with caseous necrosis. - The cellular changes and inflammation are distinct from those seen in granulomatous diseases with caseation. *Granulomatosis with polyangiitis* - This autoimmune vasculitis is characterized by **necrotizing granulomas** and **vasculitis**, primarily affecting the respiratory tract and kidneys. - While it involves necrosis within granulomas, it is described as **fibrinoid necrosis** of vessels and surrounding tissue, not the classic caseous necrosis of tuberculosis. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Infectious Diseases, pp. 383-384.

Question 1

What is the primary function of CD-95?

Accepted Answer

Inducing apoptosis

Answer

Promoting cell survival

Answer

Facilitating protein degradation

Answer

Stimulating immune response

Question 2

Which of the following organs typically develops red infarcts due to dual blood supply?

Accepted Answer

Lung

Answer

Kidney

Answer

Spleen

Answer

Heart

Question 3

Hypercoagulability due to a defective factor V gene is called:

Accepted Answer

Leiden mutation

Answer

Lisbon mutation

Answer

Antiphospholipid syndrome

Answer

Inducible thrombocytopenia syndrome

Question 4

Which of the following conditions is primarily associated with stasis as a cause of thrombosis?

Accepted Answer

Venous stasis

Answer

Polycythemia

Answer

Dehydration

Answer

Sickle cell anemia

Question 5

Which of the following statements is true regarding metastatic calcification?

Accepted Answer

Occurs in viable tissues, often due to systemic hypercalcemia.

Answer

Occurs primarily in damaged or necrotic tissues.

Answer

Calcification is associated with systemic hypercalcemia.

Answer

Serum calcium levels are typically low or normal.

Question 6

Who is credited with the introduction of electron microscopy?

Accepted Answer

Ruska

Answer

Leeuwenhoek

Answer

Robert Koch

Answer

Paul Ehrlich

Question 7

Which of the following statements is true about Russell bodies?

Accepted Answer

Eosinophilic inclusions found in plasma cells

Answer

Associated with multiple myeloma but not exclusive to it.

Answer

Not associated with any specific condition

Answer

Basophilic inclusions found in lymphocytes

Question 8

Cause of nephrocalcinosis in granulomatous diseases is?

Accepted Answer

Increased conversion to 1,25 OH

Answer

Dystrophic calcification

Answer

Mutation in calcium sensing receptor

Answer

Increased absorption

Question 9

Coagulative necrosis is due to which of the following?

Accepted Answer

Denaturation of protein

Answer

Enzymatic digestion

Answer

Infection

Answer

Increased enzymatic activity

Question 10

Caseous necrosis is typically associated with which of the following conditions?

Accepted Answer

Tuberculosis

Answer

Lymphogranuloma venereum

Answer

Cytomegalovirus infection

Answer

Granulomatosis with polyangiitis

General Pathology — MCQs

General Pathology — MCQs

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