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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The 'one gene - one enzyme' hypothesis, based on work with Neurospora, was proposed by:
सही उत्तर: क) Beadle and Tatum
George Beadle and Edward Tatum studied nutritional mutants of the mould Neurospora and concluded that each gene controls one enzyme.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The chromosomal theory of inheritance was put forward by:
सही उत्तर: क) Sutton and Boveri
Walter Sutton and Theodor Boveri noted that chromosome behaviour during meiosis parallels Mendel's factors and proposed that genes lie on chromosomes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Linkage of genes was first demonstrated experimentally in Drosophila by:
सही उत्तर: ख) T.H. Morgan
Thomas Hunt Morgan's crosses with fruit flies showed that genes on the same chromosome tend to be inherited together (linkage).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The protein part of a conjugated enzyme, without its cofactor, is called the:
सही उत्तर: ख) Apoenzyme
Apoenzyme (protein) + cofactor = holoenzyme; the apoenzyme alone is catalytically inactive.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A catalytic RNA molecule that acts like an enzyme is called a:
सही उत्तर: क) Ribozyme
Ribozymes are RNA molecules with catalytic activity, for example the peptidyl transferase activity of rRNA in the ribosome.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The Michaelis constant (Km) is the substrate concentration at which the reaction velocity is:
सही उत्तर: घ) Half of Vmax
By definition Km is the substrate concentration at which the reaction attains half its maximum velocity; a low Km means high affinity.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Enzymes that catalyse the transfer of a group (other than hydrogen) from one substrate to another are classified as:
सही उत्तर: ग) Transferases
Transferases move groups such as amino or phosphate groups between substrates (e.g. transaminases, kinases).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Enzymes speed up biochemical reactions by:
सही उत्तर: ख) Lowering the activation energy
Enzymes provide an alternative pathway with lower activation energy, so more molecules can react; they do not alter the equilibrium.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A nucleoside consists of:
सही उत्तर: घ) Nitrogenous base + pentose sugar
A nucleoside is a nitrogenous base linked to a pentose sugar (e.g. adenosine); adding a phosphate makes it a nucleotide.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which amino acid has no chiral (asymmetric) carbon atom?
सही उत्तर: ख) Glycine
In glycine the R group is a hydrogen atom, so the alpha carbon carries two identical H atoms and is not chiral.
💬 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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