General Pathology Practice Questions

Q: Which of the following is an execution caspase?

Caspase 3. Apoptosis (programmed cell death) is mediated by a family of cysteine proteases called **Caspases** [1]. These are broadly categorized into **Initiator caspases** and **Executioner (Effector) caspases**. **1. Why Caspase 3 is Correct:** Caspase 3 is the primary **Executioner Caspase**. Once activated by initiator caspases, executioners (Caspases 3, 6, and 7) cleave structural proteins and activate nucleases (like CAD - Caspase Activated DNase), leading to the characteristic morphological changes of apoptosis, such as DNA fragmentation and cell shrinkage. **2. Analysis of Incorrect Options:** * **Caspase 8:** This is an **Initiator Caspase** for the **Extrinsic (Death Receptor) Pathway** [1]. It is activated by the binding of ligands like FasL to the Fas receptor. * **Caspase 9:** This is an **Initiator Caspase** for the **Intrinsic (Mitochondrial) Pathway** [1]. It is activated when Cytochrome C is released into the cytosol and forms the "Apoptosome" complex. * **Caspase 5:** This belongs to the **Inflammatory Caspase** group (along with Caspases 1, 4, and 11), which are involved in pyroptosis and cytokine processing rather than the standard apoptotic cascade [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Initiator Caspases:** 8, 9, 10. * **Executioner Caspases:** 3, 6, 7. * **Intrinsic Pathway Marker:** Cytochrome C release from mitochondria [1]. * **Extrinsic Pathway Marker:** Activation of Caspase 8 (which can also cross-talk with the intrinsic pathway via the protein **Bid**). * **DNA Laddering:** A hallmark of apoptosis caused by internucleosomal cleavage of DNA by Caspase-activated nucleases. **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. 64-69.

Q: Which of the following stains is used to study fungal morphology in tissue sections?

PAS. **Explanation:** **Periodic Acid-Schiff (PAS)** is the correct answer because it is one of the most widely used special stains for demonstrating fungi in tissue sections. * **Mechanism:** Fungal cell walls are rich in polysaccharides (like chitin and glucan). Periodic acid oxidizes these carbohydrates to form aldehydes, which then react with the Schiff reagent to produce a brilliant **magenta/purplish-red** color. This provides excellent contrast against the tissue background, allowing for the identification of hyphae, spores, and yeast forms. **Analysis of Incorrect Options:** * **Von Kossa:** This stain is used to detect **calcium deposits** (mineralization) in tissues. It stains calcium salts black. * **Alizarin Red S:** Another specialized stain for **calcium**, often used to identify calcium oxalate crystals or bone mineralization. It produces an orange-red lake. * **Masson’s Trichrome:** This is a connective tissue stain used to differentiate between **collagen fibers** (blue/green) and muscle/cytoplasm (red). It is commonly used in liver and kidney biopsies to assess fibrosis. **High-Yield Clinical Pearls for NEET-PG:** * **Gomori Methenamine Silver (GMS):** Considered the "Gold Standard" for fungi; it stains fungal elements **black** against a green background. * **Mucicarmine:** Specifically used to identify *Cryptococcus neoformans* by staining its polysaccharide capsule **bright red**. * **India Ink:** Used for rapid identification of *Cryptococcus* in CSF (negative staining). * **Calcofluor White:** A fluorescent stain that binds to chitin; it is the most sensitive method for direct microscopic examination of fungal elements.

Q: Which of the following is seen in both apoptosis and necrosis?

May be pathological. ### Explanation The fundamental distinction between **apoptosis** (programmed cell death) and **necrosis** (accidental cell death) lies in their mechanisms and triggers. **1. Why "May be pathological" is correct:** Both processes can occur as a result of disease or injury [1]. * **Necrosis** is *always* pathological, resulting from irreversible exogenous injury (e.g., ischemia, toxins, or trauma). * **Apoptosis** is often physiological (e.g., embryogenesis, endometrial breakdown), but it can also be **pathological**. Pathological apoptosis occurs when cells are damaged beyond repair without causing a massive inflammatory response, such as in DNA damage (radiation/chemotherapy), accumulation of misfolded proteins (neurodegenerative diseases), or certain viral infections (e.g., viral hepatitis forming Councilman bodies) [1]. **2. Why other options are incorrect:** * **A. May be physiological:** This applies **only to apoptosis**. Necrosis is never a normal biological process; it is always a consequence of a harmful stimulus. * **C. Inflammation:** This is a hallmark of **necrosis** [1]. In necrosis, the cell membrane ruptures, releasing intracellular contents that trigger an inflammatory response. Apoptosis does not elicit inflammation because the cell contents are neatly packaged into apoptotic bodies. * **D. Intact cell membrane:** This is a feature of **apoptosis**. In necrosis, the loss of membrane integrity is a defining early event, leading to enzymatic leakage. ### NEET-PG High-Yield Pearls * **Councilman Bodies:** Eosinophilic apoptotic globules seen in the liver during Viral Hepatitis. * **Caspases:** The executioner enzymes of apoptosis (Cysteine proteases). * **Mitochondria:** The "central powerhouse" for the intrinsic pathway of apoptosis (releasing Cytochrome c). * **Pyknosis $\rightarrow$ Karyorrhexis $\rightarrow$ Karyolysis:** The classic sequence of nuclear changes seen in necrosis.

Question 1

Which of the following is an execution caspase?

Accepted Answer

Caspase 3

Answer

Caspase 5

Answer

Caspase 8

Answer

Caspase 9

Question 2

All of the following are transcription factors activated by signal transduction pathways of hypertrophy, except?

Accepted Answer

MLL1

Answer

GATA4

Answer

NFAT

Answer

MEF2

Question 3

Which of the following stains is used to study fungal morphology in tissue sections?

Accepted Answer

PAS

Answer

Von-kossa

Answer

Alizarin Red

Answer

Masson's Trichrome

Question 4

Which of the following is seen in both apoptosis and necrosis?

Accepted Answer

May be pathological

Answer

May be physiological

Answer

Inflammation

Answer

Intact cell membrane

Question 5

What is the chance of having cystic fibrosis if only one parent is affected and the other is normal?

Accepted Answer

50%

Answer

25%

Answer

70%

Answer

80%

Question 6

A 40-year-old female patient complains of breathlessness. She was operated for a femur fracture and is in her third trimester of pregnancy. Which type of embolism is most probably present in this patient?

Accepted Answer

Fat embolism

Answer

Air embolism

Answer

Amniotic fluid embolism

Answer

Cholesterol embolism

Question 7

A post-mortem clot is most likely to:

Accepted Answer

Grossly have the appearance of “chicken fat” overlying “currant jelly”

Answer

Grossly display features of recanalization

Answer

Grossly have lines of Zahn

Answer

Microscopically appear attached to the wall of the blood vessel

Question 8

Which of the following is NOT a transudate?

Accepted Answer

Uremic pleuritis

Answer

Superior vena cava obstruction syndrome

Answer

Nephrotic syndrome

Answer

Congestive heart failure

Question 9

Which of the following best describes the initiation of apoptosis?

Accepted Answer

The death receptors induce apoptosis when they get engaged by Fas ligand.

Answer

Cytochrome C inhibits the apoptosis activating factor.

Answer

Apoptosis may be initiated by caspase activation.

Answer

Apoptosis is mediated through DNA damage.

Question 10

A 50-year-old woman, who underwent radical mastectomy and axillary node dissection for breast cancer one year ago, now notices her arm swells by the end of the day. What is the appropriate name for this fluid accumulation?

Accepted Answer

Lymphedema

Answer

Chylothorax

Answer

Hydrothorax

Answer

Purulent exudate

General Pathology — MCQs

General Pathology — MCQs

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