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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Vegetable oils are liquid at room temperature mainly because they contain a high proportion of:
सही उत्तर: क) Unsaturated fatty acids
Double bonds in unsaturated fatty acids introduce kinks that prevent close packing, lowering the melting point so oils stay liquid.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The most abundant protein in the animal world is:
सही उत्तर: क) Collagen
Collagen, the main structural protein of connective tissues, is the most abundant protein in animals (RuBisCO is the most abundant in the whole biosphere).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Adjacent nucleotides in a strand of DNA are joined by:
सही उत्तर: ग) Phosphodiester bonds
A phosphodiester bond links the 3' carbon of one sugar to the 5' carbon of the next through a phosphate; hydrogen bonds join the two strands.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following proteins possesses a quaternary structure?
सही उत्तर: घ) Haemoglobin
Quaternary structure needs two or more polypeptide subunits; haemoglobin has four (two alpha and two beta chains), while myoglobin and lysozyme are single chains.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If a cell in G1 phase contains 2C amount of DNA, what will be its DNA content at the end of S phase?
सही उत्तर: घ) 4C
DNA replicates during S phase, so the DNA content doubles from 2C to 4C, though the chromosome number stays the same.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An organism has 2n = 8 chromosomes. Ignoring crossing over, how many genetically different combinations of chromosomes are possible in its gametes due to independent assortment?
सही उत्तर: ख) 16
Number of combinations = 2^n, where n is the haploid number; here 2^4 = 16.
💬 टिप्पणी / गल्ती रिपोर्ट (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)
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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