कृषि, पशु र वन विज्ञान प्रवेश
कृषि, पशु र वन विज्ञान प्रवेश
Agriculture, Veterinary & Forestry Entrance · २,४९३ प्रश्न
२,४९३ प्रश्न उपलब्ध। मोड छान्नुहोस्:
कृषि/वन 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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Phenylketonuria, an inborn error of metabolism, is caused by deficiency of the enzyme:
सही उत्तर: क) Phenylalanine hydroxylase
Lack of phenylalanine hydroxylase prevents conversion of phenylalanine to tyrosine, so phenylalanine and phenylpyruvic acid accumulate.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In birds, the heterogametic sex (producing two kinds of gametes) is:
सही उत्तर: ख) The female, with ZW chromosomes
Birds follow the ZW-ZZ system: females are ZW and produce two kinds of eggs, while males are ZZ.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In grasshoppers, males have only one sex chromosome (one X and no Y). This type of sex determination is:
सही उत्तर: क) XX-XO type
In the XX-XO system females are XX and males are XO, so males have one chromosome fewer than females.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The chromosome complement of a person with Klinefelter's syndrome is:
सही उत्तर: घ) 44 + XXY
Klinefelter's syndrome results from an extra X chromosome in a male, giving 47 chromosomes (44 + XXY); such males are sterile.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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How many different genotypes are possible in the human ABO blood group system?
सही उत्तर: ग) 6
Three alleles (IA, IB, i) give n(n+1)/2 = 3 x 4 / 2 = 6 genotypes: IAIA, IAi, IBIB, IBi, IAIB and ii.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A cross between two yellow mice always gives yellow and non-yellow offspring in a 2 : 1 ratio. This is explained by:
सही उत्तर: ख) A lethal allele
The yellow allele is dominant for colour but recessive lethal; homozygous yellow embryos die, so the expected 1 : 2 : 1 becomes 2 : 1.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An F2 ratio of 9 : 7 in a dihybrid cross, as seen in flower colour of sweet pea, is characteristic of:
सही उत्तर: ख) Complementary genes
With complementary genes both dominant alleles must be present for the trait, so 9 show it and the remaining 3 + 3 + 1 = 7 do not.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A modified dihybrid F2 ratio of 9 : 3 : 4 indicates:
सही उत्तर: ख) Recessive epistasis
In recessive (supplementary) epistasis, the homozygous recessive of one gene masks the other gene, combining 3 + 1 classes into 4 (e.g. coat colour in mice).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Frederick Griffith's transformation experiment (1928) was performed on mice using the bacterium:
सही उत्तर: घ) Streptococcus pneumoniae
Griffith showed that heat-killed virulent (S) Streptococcus pneumoniae could transform live non-virulent (R) cells into the virulent form.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the Hershey-Chase experiment, the protein coat of the bacteriophage was labelled with:
सही उत्तर: ग) Radioactive sulphur (35S)
Proteins contain sulphur but no phosphorus, so 35S labelled the coat while 32P labelled the DNA; only 32P entered the bacteria.
💬 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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