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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The codon AUG codes for which amino acid and also acts as the start codon?
सही उत्तर: घ) Methionine
AUG is the initiation codon and codes for methionine (formyl-methionine in prokaryotes).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The enzyme that joins Okazaki fragments is:
सही उत्तर: क) DNA ligase
DNA ligase seals the nicks between Okazaki fragments on the lagging strand.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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DNA replication is described as semi-conservative. This was experimentally proved by:
सही उत्तर: घ) Meselson and Stahl
Meselson and Stahl (1958) used 15N/14N labelling and density gradient centrifugation to prove semi-conservative replication.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If a double-stranded DNA sample has 20% adenine, what percentage of cytosine does it have?
सही उत्तर: ख) 30%
A = T = 20%, so A + T = 40%; G + C = 60%, so C = 30%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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According to Chargaff's rule, in double-stranded DNA:
सही उत्तर: ग) A + G = T + C
Since A pairs with T and G with C, purines equal pyrimidines: A + G = T + C.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In competitive inhibition of an enzyme, the inhibitor:
सही उत्तर: घ) Resembles the substrate and binds to the active site
A competitive inhibitor is structurally similar to the substrate and competes for the active site; it raises Km without changing Vmax.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An enzyme's non-protein organic cofactor that is loosely attached is called a:
सही उत्तर: घ) Coenzyme
Coenzymes are loosely bound organic cofactors (e.g. NAD+); tightly bound ones are prosthetic groups.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which nitrogenous base is found in RNA but not in DNA?
सही उत्तर: क) Uracil
RNA contains uracil in place of thymine.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Cellulose is a polymer of:
सही उत्तर: ख) β-D-glucose
Cellulose consists of β-D-glucose units linked by β-1,4 glycosidic bonds.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following is a reducing disaccharide?
सही उत्तर: ग) Maltose
Maltose has a free anomeric carbon and is reducing; sucrose is non-reducing because both anomeric carbons are in the glycosidic bond.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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