General Pathology Practice Questions

Q: Apoptotic bodies are

Clumped chromatin in membrane-bound structures. ***Cell membrane bound with organelles*** - Apoptotic bodies are **membrane-bound structures** containing remnants of the cell's cytoplasm and organelles, formed during the process of apoptosis. - They are crucial for **phagocytosis** by surrounding macrophages [1], facilitating the safe removal of dying cells. *Pyknotic nucleus without organelles* - This describes a **nucleus that has condensed**, indicating cellular injury rather than the distinct structure of apoptotic bodies. - Apoptotic bodies comprise entire sections of cell contents, including **organelles**, not just a pyknotic nucleus. *No nucleus with organelles* - This option inaccurately suggests an absence of a nucleus, which is not characteristic of apoptotic bodies; they contain **nuclear material** at various stages of condensation. - The presence of organelles indicates that the cell is undergoing controlled death, **not complete degradation**. *Clumped chromatin bodies* - While chromatin can become clumped during apoptosis, this term does not accurately reflect the **entire structure** of apoptotic bodies, which include more than just chromatin. - Apoptotic bodies specifically retain **membrane structures and organelles**, distinguishing them from merely clumped chromatin. **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.

Q: Which of the following is known as a caspase-independent programmed cell death?

Necroptosis. ***Necroptosis*** - A form of programmed cell death that is **caspase-independent**, often occurring when apoptosis is inhibited [1][2]. - It is triggered by specific signals and is associated with **inflammation and membrane rupture**, distinguishing it from traditional apoptosis [1]. *Pyroptosis* - Involves caspase-1 activation and is typically associated with **inflammatory responses** and pathogens like **bacteria** [1]. - It leads to cell swelling and lysis, but is not classified as caspase-independent. *All of the above* - Implies that all mentioned processes are caspase-independent, which is incorrect as only necroptosis fits this category. - Includes options that are specifically associated with caspase-dependent pathways, like apoptosis and pyroptosis. *Apoptosis* - A **caspase-dependent** process characterized by cell shrinkage, chromatin condensation, and formation of apoptotic bodies [3][4]. - It is a key mechanism of programmed cell death, contrasting sharply with necroptosis, which does not rely on caspases [2]. **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. 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. 69-71. [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, p. 67.

Q: What is the most common cause of death in amyloidosis?

Cardiac failure. The original text provided did not have any references with sufficient relevance (score ≥ 7) to support the claims regarding amyloidosis mortality. All provided references were evaluated and determined to be irrelevant or specific to unrelated conditions. ***Cardiac failure*** - **Cardiac amyloidosis** leads to restrictive cardiomyopathy, impairing the heart's ability to fill with blood and pump effectively. - The progressive accumulation of **amyloid fibrils** in the myocardium results in wall thickening, diastolic dysfunction, and ultimately pump failure, making it the most frequent cause of death. *Renal failure* - While **renal involvement** is common in amyloidosis, particularly AL amyloidosis, leading to proteinuria and nephrotic syndrome, it is not the leading cause of death. - The primary cause of mortality shifts more towards cardiac complications, especially with improved dialysis and kidney transplantation options. *Sepsis* - Patients with amyloidosis may be **immunocompromised** due to chronic illness or treatments, increasing their risk of infections and sepsis. - However, sepsis is typically a complication that can occur in various severe illnesses, rather than the primary and most common terminal event directly attributable to amyloid organ damage itself, as **cardiac amyloidosis** is. *None of the options* - This option is incorrect because **cardiac failure** is a well-established and the most common cause of mortality in patients with systemic amyloidosis.

Q: Which of the following statements is false regarding apoptosis?

Increase in lysosomal enzyme. ***Increase in lysosomal enzyme*** - Apoptosis is characterized by a **decrease in lysosomal activity**, as it involves a controlled process of cell death rather than the release of lysosomal enzymes [1]. - In fact, lysosomes play a larger role in **necrosis** where cellular digestion occurs due to damage, not in the orderly process of apoptosis [1]. *Intemucleosomal cleavage of nucleus* - This process occurs in apoptosis, leading to a distinct pattern of **DNA fragmentation** that is essential for the apoptotic phenomenon. - Represents a **hallmark** of apoptosis as it contributes to nuclear condensation and cell death. *Increase in caspases* - Caspases are the key executioners of apoptosis and their activation is indeed **crucial** during this process [2]. - The presence of active caspases signifies the **commitment** to the apoptotic pathway, making this statement true about apoptosis [2]. *Phosphatidyl serine has important role* - The externalization of **phosphatidylserine** to the outer leaflet of the plasma membrane is a signal for macrophages to clear the apoptotic cells. - This is a critical feature of apoptosis, as it facilitates the recognition and removal of dying cells without causing inflammation. **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. 64-65.

Q: The action of putrefactive bacteria on necrotic tissue results in?

Gangrene. ***Gangrene*** - Gangrene is the result of **tissue death** accompanied by putrefactive bacterial action, leading to **decay** and necrosis of the tissue [1]. - It can be classified into **wet** and **dry** forms, often associated with **infection and loss of blood supply** [1]. *Embolism* - Embolism refers to the **blocking** of a blood vessel by a particle, such as a blood clot or air bubble, not tissue decay. - It usually leads to **ischemia** rather than direct putrefactive changes in necrotic tissue. *Coagulation* - Coagulation is the process of **blood clotting** and is not related to the action of bacteria on necrotic tissue. - It primarily involves the transformation of blood from a liquid to a gel state, rather than tissue breakdown. *Infarction* - Infarction is the death of tissue due to **lack of blood supply**, not necessarily resulting from bacterial action. - While it can lead to necrosis, it is typically not associated with **putrefactive bacteria** directly. **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. 103-104.

Question 1

Apoptotic bodies are

Accepted Answer

Clumped chromatin in membrane-bound structures

Answer

Membrane-bound structures containing organelles

Answer

No nucleus, but contains organelles

Answer

Pyknotic nucleus in membrane-bound structures

Question 2

Which of the following is known as a caspase-independent programmed cell death?

Accepted Answer

Necroptosis

Answer

Apoptosis

Answer

Pyroptosis

Answer

None of the options

Question 3

What is the most common cause of death in amyloidosis?

Accepted Answer

Cardiac failure

Answer

Renal failure

Answer

Sepsis

Answer

None of the options

Question 4

Which of the following statements is false regarding apoptosis?

Accepted Answer

Increase in lysosomal enzyme

Answer

Phosphatidyl serine has important role

Answer

Increase in caspases

Answer

Internucleosomal cleavage of nucleus

Question 5

The action of putrefactive bacteria on necrotic tissue results in?

Accepted Answer

Gangrene

Answer

Blockage in a blood vessel

Answer

Blood clotting mechanism

Answer

Tissue death due to lack of blood supply

General Pathology — MCQs

General Pathology — MCQs

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