कृषि, पशु र वन विज्ञान B.Sc. Forestry प्रवेश तयारी
कृषि, पशु र वन विज्ञान – B.Sc. Forestry प्रवेश
B.Sc. Forestry Entrance · Agriculture, Veterinary & Forestry Entrance
२,४९३ प्रश्न उपलब्ध। मोड छान्नुहोस्:
कृषि, पशु र वन विज्ञान प्रवेश: 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 5' cap added to eukaryotic mRNA during processing is:
सही उत्तर: ग) 7-methylguanosine
Capping adds a 7-methylguanosine to the 5' end, protecting the mRNA and helping ribosome binding; the poly-A tail is added at the 3' end.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A point mutation that changes an amino-acid codon into a stop codon is called a:
सही उत्तर: घ) Nonsense mutation
A nonsense mutation creates a premature stop codon (UAA, UAG or UGA), producing a shortened polypeptide.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The first codon to be deciphered, by Nirenberg and Matthaei using a synthetic poly-U mRNA, was UUU, which codes for:
सही उत्तर: घ) Phenylalanine
Poly-U RNA in a cell-free system produced polyphenylalanine, showing that UUU codes for phenylalanine.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The 'central dogma' of molecular biology (DNA → RNA → protein) was proposed by:
सही उत्तर: ख) Francis Crick
Francis Crick stated the central dogma in 1958, describing the one-way flow of genetic information from DNA to RNA to protein.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The tryptophan (trp) operon of E. coli is an example of a/an:
सही उत्तर: ख) Repressible operon
In the trp operon, the end product tryptophan acts as a co-repressor that switches the operon off; the lac operon, in contrast, is inducible.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The attachment of a specific amino acid to its tRNA ('charging' of tRNA) is catalysed by:
सही उत्तर: ख) Aminoacyl-tRNA synthetase
Each aminoacyl-tRNA synthetase links its particular amino acid to the matching tRNA using energy from ATP.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The Shine-Dalgarno sequence of prokaryotic mRNA is:
सही उत्तर: क) A ribosome-binding site located just upstream of the start codon
The purine-rich Shine-Dalgarno sequence pairs with the 16S rRNA, positioning the ribosome at the AUG start codon.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In bacteria, the peptidyl transferase activity that forms peptide bonds during translation resides in the:
सही उत्तर: ग) 23S rRNA of the large subunit
Peptidyl transferase is a ribozyme: the 23S rRNA of the 50S subunit catalyses peptide bond formation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In eukaryotes, the 28S, 18S and 5.8S ribosomal RNAs are transcribed by:
सही उत्तर: घ) RNA polymerase I
RNA polymerase I transcribes the large rRNA precursor in the nucleolus; RNA polymerase III makes tRNA and 5S rRNA.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The sigma (σ) factor of bacterial RNA polymerase is required for:
सही उत्तर: ख) Recognising the promoter and initiating transcription
The sigma factor helps the core RNA polymerase recognise and bind the promoter; rho factor is involved in termination.
💬 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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