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
-
The bond linking two amino acids in a protein is the:
सही उत्तर: ख) Peptide bond
Amino acids are joined by peptide (amide) bonds formed between the carboxyl group of one and the amino group of the next.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
Colchicine is used to induce polyploidy because it:
सही उत्तर: घ) Inhibits spindle fibre formation
Colchicine prevents spindle formation, so chromosomes duplicate but do not separate, doubling the chromosome number.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
If a diploid cell has 2n = 24 chromosomes, how many chromosomes will each cell have at the end of meiosis I?
सही उत्तर: घ) 12
Meiosis I is reductional: homologues separate, so each daughter cell has n = 12 chromosomes (each with two chromatids).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
In which phase of the cell cycle does DNA replication take place?
सही उत्तर: ग) S phase
DNA is synthesized (replicated) in the S (synthesis) phase of interphase.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
Synapsis (pairing of homologous chromosomes) begins in which sub-stage of prophase I?
सही उत्तर: ख) Zygotene
Homologous chromosomes pair to form the synaptonemal complex during zygotene.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
Crossing over between homologous chromosomes occurs during which stage of prophase I?
सही उत्तर: क) Pachytene
Crossing over takes place at pachytene, when bivalents are fully formed; chiasmata become visible at diplotene.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
Restriction endonucleases used in recombinant DNA technology are called 'molecular scissors' because they:
सही उत्तर: ग) Cut DNA at specific recognition sequences
Restriction enzymes such as EcoRI recognise specific palindromic sequences and cut DNA there; DNA ligase joins fragments.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
A centromere located at the very end of a chromosome makes it:
सही उत्तर: घ) Telocentric
Telocentric chromosomes have a terminal centromere; acrocentric ones have it very near (but not at) one end.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
Which structure is the site of ribosomal RNA (rRNA) synthesis?
सही उत्तर: घ) Nucleolus
The nucleolus synthesizes rRNA and assembles ribosomal subunits.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
The cristae are infoldings of the:
सही उत्तर: ख) Inner mitochondrial membrane
Cristae are folds of the inner mitochondrial membrane that increase surface area for the electron transport chain.
💬 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।
नमस्ते! पाठ्यक्रम, सामान्य ज्ञान, भाषा परीक्षा वा कुनै प्रश्नको उत्तर बुझ्न सोध्नुहोस्।
AI ले गल्ती गर्न सक्छ। महत्वपूर्ण कुरा आधिकारिक स्रोतमा जाँच्नुहोस्।