Friday, 11 December 2020

1st Year Biology Chapter 6 Prokaryotics MCQs

1st Year Biology Chapter 6 Prokaryotics MCQs

If you are a student of 11th class biology and looking for the mcqs of the chapter 6 then here we have shared the 1st Year Biology Chapter 6 Prokaryotics MCQs.

• Bacteria 0.2 to 2 micron in breadth, 2 -10 micron in length 

• Volutine granules= intracytoplasmic storage form of complex inorganic polyphosphate 

• Flagella originate from basal body 

• Bacterial capsule is made up of polysaccharides and protein 

• Cell wall has peptidoglycan 

• Archaebacteria do not have peptidoglycan 

• Cell membrane in bacteria helps in respiration 

• Mesosomes also help in respiration , cell division, dna replication and export of enzyme 

• Plasmids provide resistance against antibiotics 

• Bacterial chlorophyll was discovered by Von Neil in 1930 

• Iron crystals are formed within bacterial cytoplasm 

• Conjugation - pilli- laderberg and tatum in 1946 

• Transduction - bacteriophage- laderberg and zinder 1952 

• Transformation- heat killed having effect on alive- fred griffith 1928 

• Riboflavin - vit B2 produced by clostridium 

• Vaccination - active immunization 

• Oral vaccine - polio 

• Injected vaccine- tetanus 

• Cyano bacteria pigments- chlorophyll a and phycocyanin 

• Single filament - trichome 

• Ribosomes pseudovacuoles and reserve food in form of cyanophyceae starch is present in nostoc 

• Nostoc- first colonizers of moist soil 

• Heterocyst- centre of nitrogen fixation

• Bacteria- pioneers of cellular organization 

• Prokaryotic cell wall is composed of polysaccharide chains bound covalently to shorter chains of aminoacids 

forming peptidoglycan or murien. The entire wall is regarded as molecular comole called " sacculus"

• Bacteria called as animacules by Antony Van Leeuvenhook 

• Pasteur- made vaccines for anthrax, fowl cholera and rabies 

• Robert Koch- germ theory of disease 

• Smallest bacteria(mycoplasma) is the size of largest virus(pox virus) 

• Bacteria in brown surgeonfish- Acanthrus nigrofuscus 

• True pilli are only present on gram negative bacteria 

• Pilli made up of protein pilin 

• Cell wall of archaebacteria- proteins, glycoproteins and polysaccharides 

• Chromatin body of bacteria visible under light microscope after staining with "Feulgen stain" 

• Cysts are not heat resistant 

• Green, purple sulphur and purple non sulphur bacteria are photosynthetic 

• Pseudomonas(bacilli)- aerobic bacteria 

• Spirochete- anaerobic 

• E.coli- facultative anaerobic 

• Campylobacter- microaerophilic 

• Bacteria lack mitosis and traditional sexual repro 

• Sterilization- destruction of all life forms, generally gamma rays are used 

• Moist heat- coagulation of protein and kills microbes 

• Dry heat- oxidation of chem constituents of microbes and kills them 

• Chemical substances used on living tissues that inhibit growth of microorganism- antiseptics 

• Microbicidal- kills microbes immediately 

• Microbistatic- inhibits reproductive capacities and maintains microbial population at constant size

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