आधारभूत विज्ञान (Anatomy, Physiology, Biochemistry) – Basic Sciences MCQ
आधारभूत विज्ञान (Anatomy, Physiology, Biochemistry) – MD/MS प्रवेश
Basic Sciences · MECEE-PG – MD/MS/MDS Entrance · ४३३ प्रश्न
४३३ प्रश्न उपलब्ध। मोड छान्नुहोस्:
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
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Which of the following biochemical pathways is directly inhibited by succinyl-CoA synthetase?
सही उत्तर: ख) Krebs Cycle (Citric Acid Cycle)
Succinyl-CoA synthetase is a key enzyme in the Krebs cycle. Inhibition of this enzyme directly blocks the cycle’s progression. The other pathways are distinct metabolic routes, offering plausible but incorrect alternatives.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The primary function of the Golgi apparatus within a cell is:
सही उत्तर: ग) Modification and packaging of proteins
The Golgi apparatus plays a crucial role in processing and packaging newly synthesized proteins for transport or secretion. While protein synthesis occurs elsewhere, lipid metabolism and DNA replication are distinct cellular functions. This makes the Golgi's function – modification and packaging – the most accurate answer.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following structures is most closely associated with the production of intrinsic factor, a protein essential for vitamin B12 absorption in the stomach?
सही उत्तर: क) Gastric glands (Parietal Cells)
The parietal cells within the gastric glands secrete hydrochloric acid and intrinsic factor. The other options relate to different digestive processes or regions of the stomach, making them plausible but incorrect choices.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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What is the primary function of the intrinsic factor secreted by parietal cells in the stomach?
सही उत्तर: ग) Binding to vitamin B12 for absorption in the ileum
Intrinsic factor is a glycoprotein essential for the absorption of vitamin B12 from the small intestine. It binds specifically to B12, facilitating its transport across the intestinal lining and into the bloodstream. The other options describe different roles of gastric secretions.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The Krebs cycle (Citric Acid Cycle) plays a crucial role in energy production. Which of the following statements correctly identifies its primary output?
सही उत्तर: ग) Formation of NADH and FADH2, which are subsequently used for ATP synthesis
The Krebs cycle is a central metabolic pathway that generates electron carriers (NADH and FADH2) from acetyl-CoA. These reduced coenzymes then feed into the electron transport chain, where most of the ATP is produced. The other options are incorrect regarding the primary products of the Krebs cycle.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the context of human physiology, what is the primary role of angiotensin II?
सही उत्तर: ख) Stimulating aldosterone release to increase sodium reabsorption
Angiotensin II is a potent vasoconstrictor that plays a crucial role in regulating blood pressure. Its primary action is to cause constriction of arterioles, increasing peripheral vascular resistance and thus elevating blood pressure. Option 2 describes aldosterone’s effect, while options 3 and 4 misrepresent angiotensin II's function.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following statements accurately reflects the physiological significance of phosphatidylcholine in cell membranes?
सही उत्तर: ग) It is crucial for maintaining membrane fluidity, particularly at higher temperatures
Phosphatidylcholine is the most abundant phospholipid in biological membranes. Its saturated fatty acid chains contribute significantly to membrane fluidity by disrupting tight packing and allowing for movement of lipids and proteins – making this the correct answer. The other options represent different roles of phospholipids or related molecules.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following best describes the primary function of carbonic anhydrase within red blood cells?
सही उत्तर: ख) Catalyzing the hydration of bicarbonate to form carbonic acid
Carbonic anhydrase is a critical enzyme in red blood cells that catalyzes the hydration of carbon dioxide (CO2) to form carbonic acid (H2CO3). This reaction is fundamental for maintaining blood pH and facilitating CO2 transport from tissues to the lungs. The other options describe secondary functions or processes unrelated to the primary role of this enzyme.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following cell types is primarily responsible for maintaining colloid osmotic pressure in the blood?
सही उत्तर: ख) Plasma Proteins
Plasma proteins, particularly albumin, are the major contributors to colloid osmotic pressure (oncotic pressure) within the bloodstream. The other options – red blood cells, white blood cells, and platelets – have different primary functions.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The presence of increased lactic acid levels in muscle tissue during intense exercise is most closely linked to which physiological process?
सही उत्तर: क) Oxidative phosphorylation.
Increased lactic acid production occurs as a result of anaerobic glycolysis – the breakdown of glucose without sufficient oxygen, producing lactate when the demand for ATP exceeds the capacity of oxidative metabolism. The other pathways utilize oxygen and are primarily active under aerobic conditions.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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