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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How many linkage groups are present in Drosophila melanogaster?
सही उत्तर: ग) 4
Drosophila has 2n = 8, i.e. 4 pairs of chromosomes, so it has 4 linkage groups.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a normal human female, how many Barr bodies are found in the nucleus of a somatic cell?
सही उत्तर: ख) One
A Barr body is an inactivated X chromosome; a normal XX female has one, since number of Barr bodies = number of X chromosomes minus one.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The enzyme reverse transcriptase, found in retroviruses such as HIV, synthesises:
सही उत्तर: ख) DNA from an RNA template
Reverse transcriptase copies the viral RNA genome into DNA, reversing the usual direction of transcription.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Transposons ('jumping genes') were first discovered in maize by:
सही उत्तर: घ) Barbara McClintock
Barbara McClintock discovered mobile genetic elements in maize and later received the Nobel Prize (1983).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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DNA fingerprinting, developed by Alec Jeffreys, is based mainly on the analysis of:
सही उत्तर: क) Variable number tandem repeats (VNTRs)
VNTRs (minisatellites) differ in repeat number between individuals and form the basis of DNA fingerprinting.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In recombinant DNA work, the technique that separates proteins by electrophoresis and detects them with antibodies is called:
सही उत्तर: ग) Western blotting
Southern blotting detects DNA, Northern blotting RNA, and Western blotting proteins using antibodies.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The restriction enzyme EcoRI recognises and cuts the palindromic sequence:
सही उत्तर: क) 5'-GAATTC-3'
EcoRI cuts between G and A in GAATTC, leaving sticky ends; GGATCC is BamHI and AAGCTT is HindIII.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Prions, which cause diseases such as mad cow disease (BSE), are infectious agents made of:
सही उत्तर: ग) Abnormally folded protein only
Prions are misfolded proteins without nucleic acid; they induce normal proteins to misfold.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Cyclosporin A, used as an immunosuppressant in organ transplant patients, is obtained from the fungus:
सही उत्तर: घ) Trichoderma polysporum
Cyclosporin A is produced by Trichoderma polysporum; statins come from Monascus purpureus.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Citric acid is produced commercially by fermentation using the fungus:
सही उत्तर: क) Aspergillus niger
Aspergillus niger is the industrial organism for citric acid production.
💬 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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