प्याथोलोजी, माइक्रोबायोलोजी र फार्माकोलोजी – Pathology, Microbiology & Pharmacology MCQ

प्याथोलोजी, माइक्रोबायोलोजी र फार्माकोलोजी: प्रश्न र उत्तर

सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ३ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।

सही: ० / ०

41. Which of the following best describes the pathogenesis of Pneumocystis pneumonia (PCP)? (a) Direct invasion by the fungus into lung tissue. (b) Antibody-mediated hypersensitivity reaction against Pneumocystis antigens. (c) Disruption of alveolar capillary barrier leading to fungal dissemination. (d) Activation of T cells causing a cascade of events resulting in pneumocyte death.

    क(a) Direct invasion by the fungus into lung tissue. ख(b) Antibody-mediated hypersensitivity reaction against Pneumocystis antigens. ग(c) Disruption of alveolar capillary barrier leading to fungal dissemination. घ(d) Activation of T cells causing a cascade of events resulting in pneumocyte death.
    💬 टिप्पणी / गल्ती रिपोर्ट (०)

    छलफल / प्रश्न उत्तरमा गल्ती छ

    पठाउनुहोस्

    टिप्पणी जाँचपछि मात्र देखिन्छ।

42. Howell–Jolly bodies in red cells indicate nuclear remnants, typically from antecedent abnormal red blood cell precursors. Their presence is often associated with conditions like thalassemia or certain hematological malignancies. Option A relates to erythrocyte maturation; B refers to a different cellular component; and C describes a completely unrelated phenomenon.

    कNormal red blood cell morphology indicative of healthy erythropoiesis खThe presence of ribosomes in erythrocytes indicating protein synthesis गNuclear remnants (Howell-Jolly bodies) from abnormal red blood cell precursors घEvidence of increased erythrocyte production
    💬 टिप्पणी / गल्ती रिपोर्ट (०)

    छलफल / प्रश्न उत्तरमा गल्ती छ

    पठाउनुहोस्

    टिप्पणी जाँचपछि मात्र देखिन्छ।

43. Broad, aseptate hyphae with right-angle branching in tissue strongly suggests *Candida albicans*. This characteristic morphology is diagnostic of this opportunistic yeast. Option A describes characteristics of a different fungal genus (Aspergillus), B relates to a different morphological feature of fungi and C incorrectly refers to a pathogenic bacterium.

    कCharacteristic of *Aspergillus* species खA key feature distinguishing bacterial pathogens from fungi गThe presence of spores indicating infection with a dermatophyte fungus घA distinct morphology indicative of yeast infections
    💬 टिप्पणी / गल्ती रिपोर्ट (०)

    छलफल / प्रश्न उत्तरमा गल्ती छ

    पठाउनुहोस्

    टिप्पणी जाँचपछि मात्र देखिन्छ।

44. The Arthus reaction represents a type IV hypersensitivity response, specifically involving localized cell-mediated immune reactions. This involves antigen-specific T cells activating macrophages at the site of injection, leading to inflammation and tissue damage. Option B describes a different immunological pathway (type I), C refers to an allergic reaction, and D is unrelated.

    कA type I hypersensitivity reaction characterized by immediate anaphylaxis खA type II hypersensitivity reaction involving antibody-mediated destruction of cells गA localized cell-mediated immune response at the site of injection घA systemic inflammatory response triggered by viral infection
    💬 टिप्पणी / गल्ती रिपोर्ट (०)

    छलफल / प्रश्न उत्तरमा गल्ती छ

    पठाउनुहोस्

    टिप्पणी जाँचपछि मात्र देखिन्छ।

45. Pseudomembranous colitis, commonly associated with antibiotic use, is almost always caused by *Clostridium difficile* infection. This bacteria overgrows in the colon when normal gut flora are disrupted by antibiotics, producing toxins that damage the colonic mucosa. Option A describes a mechanism of action for other antibiotics; option B refers to a different bacterial species, and C suggests an unrelated inflammatory process.

    कInfection with *Clostridium difficile* disrupting normal bowel flora खFormation of thrombi blocking blood supply to the colon गA viral infection causing inflammation of the colon lining घDirect damage to colonic mucosa by tetracycline antibiotics
    💬 टिप्पणी / गल्ती रिपोर्ट (०)

    छलफल / प्रश्न उत्तरमा गल्ती छ

    पठाउनुहोस्

    टिप्पणी जाँचपछि मात्र देखिन्छ।

46. Physostigmine differs from neostigmine in its ability to penetrate the blood-brain barrier more effectively. This allows it to exert a stronger central anticholinergic effect, blocking acetylcholine receptors throughout the brain and causing more pronounced symptoms such as confusion and hallucinations. Options B and C describe functions of neostigmine, while D is unrelated.

    कBinding primarily to muscarinic receptors in the parasympathetic nervous system खProviding sustained stimulation of acetylcholine release at neuromuscular junctions गPrimarily acting on nicotinic receptors for muscle contraction घInhibiting acetylcholinesterase activity irreversibly
    💬 टिप्पणी / गल्ती रिपोर्ट (०)

    छलफल / प्रश्न उत्तरमा गल्ती छ

    पठाउनुहोस्

    टिप्पणी जाँचपछि मात्र देखिन्छ।

47. Goodpasture’s syndrome is a type III hypersensitivity reaction characterized by antibodies directed against both glomerular basement membrane and lung capillaries, leading to vasculitis and subsequent tissue damage. This involves immune complex deposition and inflammatory responses. Option A describes a different immunological mechanism (type I), B incorrectly associates it with histamine release, and C suggests a purely localized inflammatory response.

    कType I hypersensitivity reaction involving IgE mediated inflammation खA delayed-type hypersensitivity reaction involving T cells गAn immediate hypersensitivity reaction involving mast cell degranulation घA type III hypersensitivity reaction involving immune complex deposition
    💬 टिप्पणी / गल्ती रिपोर्ट (०)

    छलफल / प्रश्न उत्तरमा गल्ती छ

    पठाउनुहोस्

    टिप्पणी जाँचपछि मात्र देखिन्छ।

48. Quinine and chloroquine primarily target the erythrocytic stage (stage III) of the malaria parasite’s life cycle. Specifically, they interfere with heme polymerization within the parasite's food vacuole, leading to oxidative stress and ultimately parasite death. Option A incorrectly states the target stage, B misidentifies a different mechanism, and C describes a completely unrelated anti-malarial action.

    कStage I of the plasmodium life cycle खStage II of the plasmodium life cycle गStage III (erythrocytic) of the plasmodium life cycle घStage IV of the plasmodium life cycle
    💬 टिप्पणी / गल्ती रिपोर्ट (०)

    छलफल / प्रश्न उत्तरमा गल्ती छ

    पठाउनुहोस्

    टिप्पणी जाँचपछि मात्र देखिन्छ।

49. The Elek's gel precipitation test detects antibodies against specific antigens within a serum sample. This reaction, causing antigen-antibody aggregation, is visually observed due to the formation of visible precipitates. Option B incorrectly associates the test with detecting bacterial growth, while option C describes a different diagnostic technique, and D outlines a completely unrelated process.

    कDetection of specific antibodies in a serum sample खIdentification of bacterial colonies on a culture plate गMeasurement of antigen concentration using spectrophotometry घSeparation of red blood cells based on size
    💬 टिप्पणी / गल्ती रिपोर्ट (०)

    छलफल / प्रश्न उत्तरमा गल्ती छ

    पठाउनुहोस्

    टिप्पणी जाँचपछि मात्र देखिन्छ।

50. Carbidopa's primary function when combined with levodopa in Parkinson’s Disease is to improve absorption across the blood-brain barrier, reducing peripheral dopamine degradation and increasing dopaminergic activity within the central nervous system. This contrasts with option B which focuses on a secondary effect that isn't its main purpose. Option C describes a mechanism irrelevant to the drug’s action, while D incorrectly suggests a purely supportive role for levodopa without Carbidopa’s contribution.

    कIncrease absorption of levodopa across the blood-brain barrier खDirectly stimulating dopamine receptors in the substantia nigra गIncreasing peripheral conversion of levodopa to dopamine घProviding antioxidant protection against oxidative stress caused by dopamine metabolism
    💬 टिप्पणी / गल्ती रिपोर्ट (०)

    छलफल / प्रश्न उत्तरमा गल्ती छ

    पठाउनुहोस्

    टिप्पणी जाँचपछि मात्र देखिन्छ।