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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Chiasmata, the X-shaped points of contact between homologous chromosomes, first become visible during:
सही उत्तर: ग) Diplotene
In diplotene the synaptonemal complex dissolves and homologues begin to separate except at the chiasmata, which then become visible.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In which stage of meiosis do homologous chromosomes separate and move to opposite poles?
सही उत्तर: ख) Anaphase I
In anaphase I homologous chromosomes separate, while sister chromatids stay joined until anaphase II.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In cross-section, a centriole shows which arrangement of microtubules?
सही उत्तर: ग) Nine peripheral triplets with no central microtubules
A centriole (and a basal body) has a cartwheel of nine triplet microtubules and no central pair (9 + 0), unlike the 9 + 2 axoneme of cilia.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Bacterial plasmids are best described as:
सही उत्तर: घ) Small, circular, double-stranded DNA molecules outside the main chromosome
Plasmids are extrachromosomal, self-replicating circular dsDNA molecules that often carry genes such as antibiotic resistance.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The 70S ribosome of a bacterial cell is made up of which two subunits?
सही उत्तर: ख) 50S and 30S
The prokaryotic 70S ribosome consists of a large 50S and a small 30S subunit; Svedberg units are not additive.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Movement of glucose into a cell down its concentration gradient with the help of a carrier protein, without the use of ATP, is called:
सही उत्तर: क) Facilitated diffusion
Facilitated diffusion uses membrane carrier or channel proteins but moves substances only down their concentration gradient, so no ATP is required.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The hybridoma technique for producing monoclonal antibodies, by fusing antibody-producing B cells with myeloma cells, was developed by:
सही उत्तर: ग) Köhler and Milstein
Georges Köhler and César Milstein developed hybridoma technology in 1975, for which they shared a Nobel Prize.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Lysosomes were discovered by:
सही उत्तर: ख) Christian de Duve
Christian de Duve discovered lysosomes in the 1950s by cell fractionation; Golgi described the Golgi apparatus and Brown the nucleus.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The uptake of fluid droplets by a cell through small invaginations of the plasma membrane ('cell drinking') is called:
सही उत्तर: ग) Pinocytosis
Pinocytosis is a form of endocytosis in which the cell takes in liquid and dissolved solutes in small vesicles; phagocytosis is the engulfing of solid particles.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Southern blotting is a technique used to detect specific:
सही उत्तर: ग) DNA sequences
Southern blotting (devised by Edwin Southern) transfers DNA fragments from a gel to a membrane and detects them with labelled probes; Northern blotting detects RNA.
💬 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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