जीव विज्ञान – Biology MCQ
जीव विज्ञान – कृषि/वन प्रवेश
Biology · Agriculture, Veterinary & Forestry Entrance · ८४० प्रश्न
८४० प्रश्न उपलब्ध। मोड छान्नुहोस्:
जीव विज्ञान: 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 pair of nitrogenous bases are purines?
सही उत्तर: ग) Adenine and guanine
Purines (adenine, guanine) have a double ring; pyrimidines (cytosine, thymine, uracil) have a single ring.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The alpha-helix secondary structure of a protein is stabilised mainly by:
सही उत्तर: घ) Hydrogen bonds
Hydrogen bonds between the C=O and N-H groups of the backbone hold the alpha-helix together.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Lactose, the sugar present in milk, on hydrolysis gives:
सही उत्तर: क) Glucose and galactose
Lactose is a disaccharide made of one glucose and one galactose unit.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Sucrose, the common table sugar, is formed by the combination of:
सही उत्तर: ख) Glucose and fructose
Sucrose is a non-reducing disaccharide of glucose and fructose.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In animals, the storage polysaccharide found mainly in the liver and muscles is:
सही उत्तर: ग) Glycogen
Animals store glucose as glycogen, chiefly in liver and skeletal muscle.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The most abundant organic compound on earth is:
सही उत्तर: ग) Cellulose
Cellulose, the main component of plant cell walls, is the most abundant organic compound in the biosphere.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In each cycle, the sodium-potassium pump of an animal cell membrane moves:
सही उत्तर: घ) 3 Na+ out and 2 K+ in
Using one ATP, the Na+/K+ ATPase expels 3 sodium ions and brings in 2 potassium ions.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When a plant cell is placed in a strongly hypertonic solution, the protoplast shrinks away from the cell wall. This is called:
सही उत्तर: घ) Plasmolysis
Water leaves the cell by exosmosis in a hypertonic solution, so the protoplast contracts away from the wall (plasmolysis).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The 80S ribosome of a eukaryotic cell is made up of which two subunits?
सही उत्तर: क) 60S and 40S
Eukaryotic 80S ribosomes consist of a large 60S and a small 40S subunit (S values are not additive).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A mesosome, an infolding of the plasma membrane, is found in:
सही उत्तर: क) Bacteria
Mesosomes are membranous extensions seen in bacterial cells, thought to help in respiration, secretion and cell wall formation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
यी अभ्यास प्रश्न हुन्, आधिकारिक प्रश्न होइनन्। पाठ्यक्रम, विज्ञापन र नतिजाका लागि सम्बन्धित निकायको आधिकारिक वेबसाइट हेर्नुहोस्। उत्तरमा गल्ती भेटे प्रश्नमुनिको "टिप्पणी / गल्ती रिपोर्ट" मा लेख्नुहोस्।
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