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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Which early human species is called the 'handy man' because it is believed to have made the first stone tools?
सही उत्तर: घ) Homo habilis
Homo habilis ('handy man') lived about 2 million years ago, had a brain of about 650-800 cc and made simple stone tools.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The founder effect, in which a few individuals start a new population with different allele frequencies, is a form of:
सही उत्तर: ग) Genetic drift
The founder effect is a chance change in allele frequency due to a small founding sample, i.e. a special case of genetic drift.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The variety of finches on the Galapagos Islands, each with beaks suited to different foods, is an example of:
सही उत्तर: क) Adaptive radiation
From one ancestral seed-eating finch many forms evolved to fill different niches in one area, which is adaptive radiation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Charles Darwin's book 'On the Origin of Species' was published in:
सही उत्तर: ग) 1859
Darwin published his theory of evolution by natural selection in 'On the Origin of Species' in 1859.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The haploid human genome contains approximately how many base pairs?
सही उत्तर: ग) 3 x 10^9
The Human Genome Project found about 3 billion (3 x 10^9) base pairs in the haploid human genome.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A frameshift mutation results from:
सही उत्तर: ग) Insertion or deletion of a nucleotide
Adding or removing a base (not in multiples of three) shifts the reading frame, changing every codon read after the mutation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The wobble hypothesis, explaining relaxed base pairing at the third position of a codon, was proposed by:
सही उत्तर: घ) Francis Crick
Francis Crick (1966) proposed that the third base of a codon can pair loosely with the anticodon, so one tRNA can read several codons.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The genetic code is described as 'degenerate' because:
सही उत्तर: क) Most amino acids are coded by more than one codon
61 sense codons code for only 20 amino acids, so many amino acids have more than one codon (e.g. leucine has six).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Out of the 64 triplet codons, how many code for amino acids?
सही उत्तर: ग) 61
Three codons (UAA, UAG, UGA) are stop codons, leaving 64 - 3 = 61 sense codons that specify amino acids.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which type of RNA brings specific amino acids to the ribosome during translation?
सही उत्तर: घ) tRNA
Transfer RNA carries an amino acid at its 3' end and has an anticodon that pairs with the matching codon on mRNA.
💬 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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