कृषि, पशु र वन विज्ञान B.Sc. Ag र B.V.Sc. & A.H. प्रवेश तयारी
कृषि, पशु र वन विज्ञान – B.Sc. Ag र B.V.Sc. & A.H. प्रवेश
B.Sc. Ag & B.V.Sc. 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 wobble hypothesis, explaining relaxed base pairing at the third position of a codon, was proposed by:
सही उत्तर: घ) Francis Crick
Francis Crick (1966) proposed that the third base of a codon can pair loosely with the anticodon, so one tRNA can read several codons.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The genetic code is described as 'degenerate' because:
सही उत्तर: क) Most amino acids are coded by more than one codon
61 sense codons code for only 20 amino acids, so many amino acids have more than one codon (e.g. leucine has six).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Out of the 64 triplet codons, how many code for amino acids?
सही उत्तर: ग) 61
Three codons (UAA, UAG, UGA) are stop codons, leaving 64 - 3 = 61 sense codons that specify amino acids.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which type of RNA brings specific amino acids to the ribosome during translation?
सही उत्तर: घ) tRNA
Transfer RNA carries an amino acid at its 3' end and has an anticodon that pairs with the matching codon on mRNA.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In eukaryotes, the precursor of mRNA (hnRNA) is transcribed by:
सही उत्तर: क) RNA polymerase II
RNA polymerase II transcribes hnRNA; polymerase I makes 28S, 18S and 5.8S rRNA, and polymerase III makes tRNA, 5S rRNA and snRNAs.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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DNA polymerase can synthesise a new DNA strand only in the:
सही उत्तर: घ) 5' to 3' direction
DNA polymerase adds nucleotides only to a free 3'-OH end, so new strands always grow 5' to 3'; this is why the lagging strand is discontinuous.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which enzyme unwinds the DNA double helix at the replication fork?
सही उत्तर: घ) Helicase
Helicase breaks the hydrogen bonds between the base pairs and opens the two strands to form the replication fork.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The core of a nucleosome contains how many histone protein molecules?
सही उत्तर: ख) 8
A nucleosome core is a histone octamer (two each of H2A, H2B, H3 and H4) around which about 146 bp of DNA is wrapped.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the B-form of DNA, the distance between two consecutive base pairs is:
सही उत्तर: ग) 0.34 nm
B-DNA has about 10 base pairs per turn with a pitch of 3.4 nm, so successive base pairs are 0.34 nm apart; the helix diameter is 2 nm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the recombination frequency between two linked genes is 12%, the distance between them on the genetic map is:
सही उत्तर: क) 12 centimorgans
One map unit (centimorgan) equals 1% recombination, so 12% recombination corresponds to 12 cM.
💬 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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