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
२,४५४ 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 enzyme that joins Okazaki fragments is:
सही उत्तर: ख) DNA ligase
DNA ligase seals the nicks between Okazaki fragments by forming phosphodiester bonds. Helicase unwinds the double helix at the replication fork.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Okazaki fragments are formed during DNA replication on the:
सही उत्तर: घ) Lagging strand
On the lagging strand DNA is synthesised discontinuously as short Okazaki fragments, because polymerase works only in the 5'→3' direction. The leading strand is made continuously.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The start codon AUG codes for the amino acid:
सही उत्तर: क) Methionine
AUG initiates translation and codes for methionine (formyl-methionine in bacteria). UGG is the single codon for tryptophan.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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How many of the 64 codons are stop (termination) codons?
सही उत्तर: ख) 3
UAA, UAG and UGA are the three stop codons, leaving 61 codons that code for amino acids. AUG is the start codon.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If a double-stranded DNA molecule contains 20% adenine, the percentage of cytosine is:
सही उत्तर: घ) 30%
By Chargaff's rule A = T = 20%, so G + C = 60% and C = 30%. 20% would be the thymine content, not cytosine.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which nitrogenous base is present in RNA but not in DNA?
सही उत्तर: क) Uracil
RNA contains uracil in place of thymine, and uracil pairs with adenine. Cytosine and adenine are found in both DNA and RNA.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The karyotype of a person with Klinefelter syndrome is:
सही उत्तर: ग) 47, XXY
Klinefelter syndrome is a male with an extra X chromosome (44 + XXY). 45, XO is Turner syndrome found in females.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Down syndrome is caused by:
सही उत्तर: घ) Trisomy of chromosome 21
Down syndrome results from an extra copy of chromosome 21 (47 chromosomes). Monosomy X (45, XO) causes Turner syndrome.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Haemophilia in humans is inherited as a:
सही उत्तर: ख) Sex-linked recessive trait
The haemophilia gene lies on the X chromosome and is recessive, so it appears mostly in males while females are usually carriers. Colour blindness follows the same pattern.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In poultry, which sex is heterogametic?
सही उत्तर: क) Female (ZW)
Birds follow the ZW system: hens are ZW and cocks are ZZ, so the hen determines the sex of the chick. In humans, by contrast, the male is heterogametic (XY).
💬 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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