जीव विज्ञान – Biology MCQ
जीव विज्ञान – कृषि/वन प्रवेश
Biology · Agriculture, Veterinary & Forestry Entrance · ८४० प्रश्न
८४० प्रश्न उपलब्ध। मोड छान्नुहोस्:
जीव विज्ञान: 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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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)
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Inulin, a storage polysaccharide found in dahlia tubers, is a polymer of:
सही उत्तर: ख) Fructose
Inulin is a polyfructan, i.e. a polymer of fructose units, unlike starch and glycogen which are polymers of glucose.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the open sea (ocean) ecosystem, the pyramid of biomass is generally:
सही उत्तर: ग) Inverted
In the sea the standing biomass of fast-reproducing phytoplankton at any moment is smaller than that of the fishes feeding on them, so the biomass pyramid is inverted.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Lecithin is an example of a:
सही उत्तर: ग) Phospholipid
Lecithin (phosphatidylcholine) is a phospholipid containing glycerol, fatty acids, phosphate and choline; it is a major membrane lipid.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The most abundant protein in the whole biosphere is:
सही उत्तर: घ) RuBisCO
RuBisCO, the CO2-fixing enzyme of photosynthesis present in all green plants, is the most abundant protein on earth; collagen is most abundant in animals.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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