General Pathology Practice Questions

Q: Pro-apoptotic genes and anti-apoptotic genes belong to which gene family?

Bcl (B-cell lymphoma). ***Bcl*** [1] - Pro-apoptotic and anti-apoptotic genes are part of the **Bcl-2 gene family**, which regulates apoptosis [1,2]. - This family includes key **regulators** that either promote or inhibit cell death, thus playing a crucial role in cellular health [1,2]. *BRAF* - BRAF is primarily known as a **proto-oncogene** that plays a role in cell signaling related to **cell growth** and **division** rather than apoptosis. - While it is important in cancer biology, it does not directly regulate apoptotic pathways like Bcl does. *Rb* - The Rb gene is a **tumor suppressor** involved in cell cycle regulation but does not classify as a direct modulator of apoptosis. - Its primary function is to prevent excessive cell growth by inhibiting progression through the cell cycle. *p53* - Although p53 is involved in regulating the **cell cycle** and can induce apoptosis under stress conditions, it is not part of the Bcl-2 gene family [1]. - It acts primarily as a **guardian of the genome**, responding to DNA damage rather than being classified as a pro- or anti-apoptotic gene per se [1]. **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. 65-67; Neoplasia, pp. 303-304, 310-311.

Q: Which of the following amyloid forms is seen in secondary amyloidosis associated with chronic diseases?

AA amyloid. ***Amyloid Associated Protein*** - This form is particularly linked with **secondary amyloidosis**, commonly seen in conditions like chronic infections or inflammatory diseases [1]. - It is derived from **serum amyloid A (SAA)** protein, which elevates in response to inflammation, leading to the accumulation of amyloid fibrils [1][2]. *ATTR* - Stands for **transthyretin amyloidosis**, associated with genetic mutations or aging, not typically related to chronic secondary causes. - Involves proteins that primarily affect the **heart** and **nervous system**, particularly distinct from secondary amyloid deposits. *Amyloid light chain* - Primarily associated with **primary amyloidosis (AL)**, resulting from monoclonal plasma cell disorders, differing from the context of chronic diseases. - Characterized by deposition of **light chains from immunoglobulins**, rather than the **serum amyloid A** found in secondary amyloidosis [1]. *Beta 2 Amyloid* - Refers to **beta-amyloid** peptide associated with **Alzheimer's disease**, unrelated to secondary amyloidosis or chronic inflammatory states. - It is associated more with **neurological** pathologies, specifically the formation of plaques, rather than systemic amyloid deposition. **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. 136-140. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 267-268.

Q: White infarcts are seen in all the following organs except:

Lung. ***Lung*** - The lung typically exhibits **red infarcts** due to its dual blood supply from the pulmonary and bronchial arteries, which can cause hemorrhagic infarction [1]. - **White infarcts** are usually associated with organs that have a single blood supply, making the lung an exception in this context. *Kidney* - The kidney is prone to **white infarcts** due to its single blood supply via the renal artery, leading to coagulative necrosis upon occlusion [1]. - This characteristic is common in many solid organs with similar vascular anatomy. *Spleen* - The spleen also shows a tendency for **white infarcts**, especially in cases of **splenic artery occlusion** [1]. - Like the kidney, it has a singular arterial supply, which is a key factor in the formation of white infarcts. *Heart* - Myocardial infarction in the heart typically presents as **white infarcts**, particularly in areas where blood flow is compromised [1]. - The heart's blood supply functions primarily through the coronary arteries, justifying the occurrence of white infarcts during occlusion. **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: In apoptosis, cytochrome C acts through:

Apaf1. ***Apaf1*** - Cytochrome C released from the mitochondria binds to **Apaf1**, which leads to the formation of the **apoptosome** [1][2]. - This complex activates **caspase-9**, initiating the caspase cascade that leads to apoptosis [2]. *TNF* - Tumor Necrosis Factor (TNF) is involved in **necrosis** and **inflammatory processes**, not directly in the intrinsic pathway of apoptosis. - It activates **caspase-8**, which is part of the **extrinsic pathway**, differing from the role of cytochrome C [1]. *FADD* - FADD (Fas-associated protein with death domain) is part of the **death receptor pathway**, linking to caspase-8, not associated with cytochrome C [1]. - It does not play a role in the assembly of the apoptosome like Apaf1 does. *Bcl_2* - Bcl-2 is an **anti-apoptotic protein** that inhibits apoptosis rather than inducing it or acting through cytochrome C [1]. - It functions by preventing the release of cytochrome C from mitochondria, thereby opposing the apoptotic process [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, p. 310. [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. 64-67.

Q: Which of the following statements is true about apoptosis?

No inflammation is associated with apoptosis.. ***Swelling of organelles*** - Apoptosis is characterized by **shrinkage of the cell** and not swelling of organelles, which is more typical of necrosis [1][4]. - During apoptosis, organelles like the mitochondria undergo specific changes, leading to cell death without inflammation [3]. *No inflammation* - Apoptosis is indeed a **non-inflammatory process**, contrasting with necrosis, which typically provokes an inflammatory response [1]. - The cell death in apoptosis occurs quietly without affecting surrounding tissues significantly. *Intact plasma membrane* - During apoptosis, the plasma membrane remains **intact** until the very late stages, unlike in necrosis where it becomes compromised [1]. - The preservation of membrane integrity is crucial for the cell to package its contents effectively. *Affected by dedicated genes* - Apoptosis is regulated by various **genes and signaling pathways**, particularly involving caspases and Bcl-2 family proteins [2][3]. - Genetic factors play a critical role in controlling apoptotic cell death and its proper execution [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, pp. 69-71. [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. 63-64. [3] 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. [4] 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. 49-50.

Q: What is the most common source of systemic emboli?

Cardiac thrombi. **Cardiac thrombi** - **Cardiac thrombi**, particularly those forming in the left atrium in conditions like **atrial fibrillation** or on damaged heart valves, are the most frequent source of systemic emboli [2]. - These thrombi can dislodge and travel through the arterial system, causing **ischemia** in various organs such as the brain (**stroke**), limbs, or kidneys [2]. *Varicose veins* - While varicose veins are a common venous condition, they are not typically a source of systemic arterial emboli. - Thrombi in varicose veins are usually superficial and rarely lead to significant embolism, and if they do, they would typically travel to the lungs (pulmonary embolism), not the systemic arterial circulation. *Pulmonary embolism* - A **pulmonary embolism** occurs when an embolus (often from a DVT) travels to the lungs, blocking pulmonary arteries [3]. - This is an arterial event within the pulmonary circulation and not a source of systemic emboli in the arterial circulation that supplies organs like the brain or limbs. *Deep vein thrombosis* - **Deep vein thrombosis (DVT)** involves the formation of blood clots in deep veins, most commonly in the legs [1]. - While DVTs are the primary source of **pulmonary emboli**, they do not typically cause systemic arterial emboli unless there is a right-to-left shunt in the heart (paradoxical embolism).

Q: A primary structural defect of an organ resulting from an intrinsically abnormal developmental process is termed as:

Malformation. ***Malformation*** - Refers to a **primary structural defect** present at birth, arising during development, leading to abnormal organ structure. - Typically involves intrinsic factors and can affect any organ or system, making it a key category of congenital anomalies. *Association* - Describes a **non-random occurrence** of two or more anomalies but does not indicate a structural defect of a specific organ. - Does not imply a direct defect, as it can occur without an **underlying structural issue** in a particular organ. *Deformation* - Refers to a change in the **shape or structure** of a normally formed organ or body part due to an external force rather than an intrinsic defect [1]. - Examples include clubfoot or positional plagiocephaly, which are not classified as malformations [1]. *Disruption* - Involves the breakdown of an originally normal tissue or organ due to extrinsic factors, leading to secondary structural defects. - Not inherent to the embryological development process itself, differentiating it from intrinsic faults like malformations. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 460-462.

Question 1

What is the most common site and type of metaplasia in the human body?

Accepted Answer

Respiratory tract epithelium, Squamous metaplasia

Answer

Respiratory tract epithelium, Columnar metaplasia

Answer

Esophagus, Squamous metaplasia

Answer

Esophagus, Columnar metaplasia

Question 2

Irreversible cell injury is indicated by

Accepted Answer

Calcium accumulation in cells

Answer

Myelin figures

Answer

Decreased ATP levels

Answer

Loss of ribosomal attachment

Question 3

Pro-apoptotic genes and anti-apoptotic genes belong to which gene family?

Accepted Answer

Bcl (B-cell lymphoma)

Answer

p53 (Tumor Suppressor Gene)

Answer

Rb (Retinoblastoma protein)

Answer

BRAF (B-Raf proto-oncogene)

Question 4

Amyloidosis is associated with all of the following conditions except:

Accepted Answer

Acute inflammatory conditions

Answer

Multiple myeloma

Answer

Renal failure

Answer

Chronic inflammatory conditions

Question 5

Which of the following amyloid forms is seen in secondary amyloidosis associated with chronic diseases?

Accepted Answer

AA amyloid

Answer

Amyloid light chain

Answer

ATTR

Answer

Amyloid beta (Aβ)

Question 6

White infarcts are seen in all the following organs except:

Accepted Answer

Lung

Answer

Kidney

Answer

Heart

Answer

Spleen

Question 7

In apoptosis, cytochrome C acts through:

Accepted Answer

Apaf1

Answer

FADD

Answer

TNF

Answer

Bcl-2

Question 8

Which of the following statements is true about apoptosis?

Accepted Answer

No inflammation is associated with apoptosis.

Answer

Apoptosis is an unregulated process.

Answer

Plasma membrane integrity is lost during apoptosis.

Answer

Cell swelling and organelle rupture occur during apoptosis.

Question 9

What is the most common source of systemic emboli?

Accepted Answer

Cardiac thrombi

Answer

Varicose veins

Answer

Pulmonary embolism

Answer

Deep vein thrombosis

Question 10

A primary structural defect of an organ resulting from an intrinsically abnormal developmental process is termed as:

Accepted Answer

Malformation

Answer

Disruption

Answer

Deformation

Answer

Association

General Pathology — MCQs

General Pathology — MCQs

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