General Pathology — MCQs

General Pathology Indian Medical PG Practice Questions and MCQs

Question 1481: Which of the following is LEAST likely to be a feature of an exudate?

A. Pleural fluid cholesterol > 55 mg/dL
B. Fluid : Serum Protein ratio > 0.5
C. Fluid : Serum LDH ratio > 0.6
D. Serum-Pleural fluid Albumin gradient > 1.2 g/dL (Correct Answer)

Explanation: ***Serum-Pleural fluid Albumin gradient > 1.2 g/dL*** - A **serum-pleural albumin gradient greater than 1.2 g/dL** is a characteristic feature of a **transudate**, NOT an exudate. - In exudates, increased capillary permeability allows albumin to leak into the pleural space, **narrowing the gradient** between serum and pleural fluid albumin levels [2]. - An exudate typically has a **serum-pleural albumin gradient < 1.2 g/dL** (small difference between serum and pleural albumin). - Therefore, a gradient **> 1.2 g/dL** is **LEAST likely** to be a feature of an exudate and instead suggests a transudate [2]. *Pleural fluid cholesterol > 55 mg/dL* - Exudates characteristically have **high pleural fluid cholesterol** levels (> 45-55 mg/dL) due to increased capillary permeability and inflammation. - This is a **typical feature of exudates**, making it likely, not least likely. *Fluid : Serum Protein ratio > 0.5* - This is one of **Light's criteria** for identifying an exudate [1]. - Exudates have **high protein content** due to increased vascular permeability [2]. - A fluid-to-serum protein ratio **> 0.5** is a **classic feature of exudates** [1]. *Fluid : Serum LDH ratio > 0.6* - This is another **Light's criterion** for exudates. - Elevated LDH in pleural fluid reflects cellular damage and inflammation. - A fluid-to-serum LDH ratio **> 0.6** is a **typical feature of exudates**. **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. 234-235. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 728-729.

Question 1482: Which of the following is known as a caspase-independent programmed cell death?

A. Necroptosis (Correct Answer)
B. Apoptosis
C. Pyroptosis
D. None of the options

Explanation: ***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.

Question 1483: Which of the following statements is false regarding apoptosis?

A. Phosphatidyl serine has important role
B. Increase in caspases
C. Increase in lysosomal enzyme (Correct Answer)
D. Internucleosomal cleavage of nucleus

Explanation: ***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.

Question 1484: Lysosomal transport defect is seen in which of the following conditions?

A. Cystinosis (Correct Answer)
B. Gaucher's disease
C. Metachromatic leukodystrophy
D. Tay-Sachs disease

Explanation: ***Cystinosis*** - Cystinosis is characterized by **lysosomal transport defects** leading to the accumulation of cystine within lysosomes. - This condition results in **multisystemic involvement**, primarily affecting the kidneys and eyes, due to the inability to effectively transport cystine out of the lysosomes. *Metachromatic leukosytrophy* - Caused by deficiency of the **enzyme arylsulfatase A**, leading to sulfatide accumulation in lysosomes [1]. - It primarily affects the **nervous system** and is not primarily linked to a defect in lysosomal transport. *Goucher's disease* - Results from a deficiency of the enzyme **glucocerebrosidase**, leading to glucocerebroside accumulation [1]. - It mainly affects the **spleen, liver, and bone marrow**, rather than a generalized lysosomal transport defect. *Tay Sach's disease* - Caused by a deficiency in the **enzyme hexosaminidase A**, leading to GM2 ganglioside accumulation in neurones [1]. - This condition primarily affects the **nervous system** and does not involve a defect in lysosomal transport [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Genetic Disorders, pp. 159-164.

Question 1485: The action of putrefactive bacteria on necrotic tissue results in?

A. Gangrene (Correct Answer)
B. Blockage in a blood vessel
C. Blood clotting mechanism
D. Tissue death due to lack of blood supply

Explanation: ***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.

Practice by Chapter

Cell Injury and Cell Death

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Adaptations of Cellular Growth

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Accumulations and Deposits

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Acute and Chronic Inflammation

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Tissue Repair and Wound Healing

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Hemodynamic Disorders

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Genetic Disorders

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Environmental Pathology

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Nutritional Diseases

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Molecular Basis of Disease

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