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

171. A patient presents with symptoms consistent with classical phenylketonuria (PKU). Which enzymatic deficiency is most directly implicated in this condition?

     कGlucose-6-phosphate dehydrogenase खTyrosinase गPhenylalanine hydroxylase घLactate dehydrogenase
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     छलफल / प्रश्न उत्तरमा गल्ती छ

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172. Which of the following best describes the role of the 'funny current' (If) within the SA node’s cardiac conduction system?

     कIt initiates ventricular contraction खIt maintains a resting membrane potential गIt delays repolarization of Purkinje fibers घIt is responsible for the rapid depolarization during sinoatrial node activation
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     टिप्पणी जाँचपछि मात्र देखिन्छ।

173. Antidiuretic hormone (ADH) primarily regulates water reabsorption in the collecting duct through its action on which specific receptors?

     कAldosterone receptors खVasopressin receptors गAngiotensin II receptors घAtrial natriuretic peptide receptors
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174. Which of the following amino acids is considered a precursor for neurotransmitter synthesis (specifically dopamine)?

     कA) Valine खB) Leucine गC) Tyrosine घD) Glutamine
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175. The presence of elevated levels of serum amylase would most likely indicate damage to which organ?

     कA) Liver खB) Pancreas गC) Kidney घD) Thyroid.
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176. Which of the following best describes the role of cytochrome oxidase in oxidative phosphorylation?

     कA) It directly transfers electrons from NADH to FAD. खB) It catalyzes the final step of electron transfer, reducing oxygen to water. गC) It pumps protons across the inner mitochondrial membrane. घD) It synthesizes ATP molecules from ADP and inorganic phosphate.
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177. The primary function of osteocalcin in bone remodeling is:

     कA) Stimulation of osteoclast activity leading to bone resorption. खB) Promotion of osteoblast differentiation and bone formation. गC) Regulation of calcium concentration within the extracellular fluid. घD) Inhibition of angiogenesis around developing bone tissue.
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178. Which of the following statements correctly describes the function of carbonic anhydrase?

     कA) Catalyzes the breakdown of glucose for energy production. खB) Facilitates the conversion of carbon dioxide and water into bicarbonate ions and protons. गC) Directly transports oxygen molecules from the lungs to tissues. घD) Promotes the synthesis of collagen in fibroblasts.
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179. The majority of red blood cells are produced in which bone marrow compartment?

     कErythroblast compartment खMegakaryocyte compartment गAdipose compartment घLymphoid compartment
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180. The term 'myotatic reflex' describes which physiological phenomenon?

     कStretch reflex खDeep tendon reflex गGolgi tendon reflex घProprioceptive reflex
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     टिप्पणी जाँचपछि मात्र देखिन्छ।