आधारभूत विज्ञान (Anatomy, Physiology, Biochemistry) – Basic Sciences MCQ

आधारभूत विज्ञान (Anatomy, Physiology, Biochemistry): प्रश्न र उत्तर

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

सही: ० / ०

201. Which of the following statements best describes the primary function of the sinoatrial node (SA node)? (a) To filter blood returning to the heart. (b) To initiate and regulate the heartbeat through spontaneous electrical impulses. (c) To receive signals from baroreceptors and adjust heart rate accordingly. (d) To store calcium ions for muscle contraction.

     क(a) To filter blood returning to the heart. ख(b) To initiate and regulate the heartbeat through spontaneous electrical impulses. ग(c) To receive signals from baroreceptors and adjust heart rate accordingly. घ(d) To store calcium ions for muscle contraction.
     💬 टिप्पणी / गल्ती रिपोर्ट (०)

     छलफल / प्रश्न उत्तरमा गल्ती छ

     पठाउनुहोस्

     टिप्पणी जाँचपछि मात्र देखिन्छ।

202. Aldosterone is secreted primarily by the zona glomerulosa of the adrenal cortex. This zone responds to angiotensin II and potassium levels, stimulating aldosterone production.

     कZona Fasciculata खZona Medulla गZona Reticularis घCortex Densa
     💬 टिप्पणी / गल्ती रिपोर्ट (०)

     छलफल / प्रश्न उत्तरमा गल्ती छ

     पठाउनुहोस्

     टिप्पणी जाँचपछि मात्र देखिन्छ।

203. The key laboratory finding associated with Wilson’s Disease is elevated levels of ceruloplasmin in the serum. This is due to the body attempting to compensate for copper deficiency by overproducing this antioxidant protein.

     कElevated Ferritin खLow Transferrin Saturation गHigh Serum Copper घElevated Albumin
     💬 टिप्पणी / गल्ती रिपोर्ट (०)

     छलफल / प्रश्न उत्तरमा गल्ती छ

     पठाउनुहोस्

     टिप्पणी जाँचपछि मात्र देखिन्छ।

204. A young man with muscle cramps and myoglobinuria on exercise, without significant lactate elevation suggests rhabdomyolysis. Myoglobin released from damaged muscle cells into the bloodstream causes this condition.

     कPeriodic Paralysis खDuchenne Muscular Dystrophy गMyasthenia Gravis घLambert-Eaton Myasthenic Syndrome
     💬 टिप्पणी / गल्ती रिपोर्ट (०)

     छलफल / प्रश्न उत्तरमा गल्ती छ

     पठाउनुहोस्

     टिप्पणी जाँचपछि मात्र देखिन्छ।

205. The rate-limiting enzyme in glycolysis is phosphofructokinase (PFK). This enzyme catalyzes the committed step of glycolysis, regulating the flux of glucose through the pathway.

     कHexokinase खGlucose-6-Phosphate Dehydrogenase गFructose-1,6-Bisphosphatase घAldolase
     💬 टिप्पणी / गल्ती रिपोर्ट (०)

     छलफल / प्रश्न उत्तरमा गल्ती छ

     पठाउनुहोस्

     टिप्पणी जाँचपछि मात्र देखिन्छ।

206. Pellagra-like skin rash with neutral aminoaciduria, due to defective intestinal and renal absorption indicates deficiencies of tryptophan, histidine, or cysteine. These are essential amino acids that cannot be synthesized by the body and require efficient transport across epithelial membranes.

     कTyrosine खPhenylalanine गMethionine घLysine
     💬 टिप्पणी / गल्ती रिपोर्ट (०)

     छलफल / प्रश्न उत्तरमा गल्ती छ

     पठाउनुहोस्

     टिप्पणी जाँचपछि मात्र देखिन्छ।

207. Okazaki fragments are short DNA segments synthesized by DNA polymerase III during lagging strand replication. They require RNA primer extension and subsequent removal before the next fragment can be added.

     कRolling Circle Replication खTheta Polymerase गD-loop formation घSingle Strand Displacement (SSD) replication
     💬 टिप्पणी / गल्ती रिपोर्ट (०)

     छलफल / प्रश्न उत्तरमा गल्ती छ

     पठाउनुहोस्

     टिप्पणी जाँचपछि मात्र देखिन्छ।

208. McArdle disease (Type V glycogen storage disorder) is characterized by a deficiency in muscle phosphorylase, the enzyme responsible for initiating glycogenolysis. This leads to an accumulation of glycogen in muscles and impaired energy production during exercise.

     कGota खGlycogen Storage Disease Type II गVon Gierke Disease घHunter Syndrome
     💬 टिप्पणी / गल्ती रिपोर्ट (०)

     छलफल / प्रश्न उत्तरमा गल्ती छ

     पठाउनुहोस्

     टिप्पणी जाँचपछि मात्र देखिन्छ।

209. Taste sensation from the anterior two-thirds of the tongue is processed by the gustatory receptors located on the front portion of the tongue. The posterior third of the tongue has a different representation of taste modalities.

     कSweet Taste खSalty Taste गBitter Taste घUmami Taste
     💬 टिप्पणी / गल्ती रिपोर्ट (०)

     छलफल / प्रश्न उत्तरमा गल्ती छ

     पठाउनुहोस्

     टिप्पणी जाँचपछि मात्र देखिन्छ।

210. Milk ejection (let-down) during breastfeeding is triggered by oxytocin release, primarily from the posterior pituitary gland. Oxytocin stimulates the contraction of myoepithelial cells surrounding the mammary glands, leading to milk secretion. The other options represent different hormonal pathways.

     कProlactin खGrowth Hormone गVasopressin घCortisol
     💬 टिप्पणी / गल्ती रिपोर्ट (०)

     छलफल / प्रश्न उत्तरमा गल्ती छ

     पठाउनुहोस्

     टिप्पणी जाँचपछि मात्र देखिन्छ।