Hum 300 History And Mefthods Of Science

What is a computer computer computer computer computer virus ? Why argon they so nasty to controlViruses argon microscopic particles of 20-300nm in size , cause intra cellular phoneular telephoneular parasites they whoremaster have got up only by invading and taking oer other cells as they leave bulge out the cellular machinery for self-importance echo . Host range holds a wide con workation of animate being and plants There argon viruses which offer infect bacterium and they are called batceriophage . A complete virus particle is called virion consisting of its uncomplicated nucleic erosive (either ribonucleic acid or deoxyribonucleic acid ) and a protein come out called capsid . Viruses with DNA as transmissible sensible are called DNA virus ( eg herpes virus or Adenovirus etc ) and those with ribonucleic acid as genetic material are called RNA viruses ( e .g : Foot and Mouth indisposition virus , SARS virus human immunodeficiency virus etc . Virus encoded proteins model the capsid . The nucleic acid and the capsid together termed as nucleocapsid . accredited viruses have a tissue layer or envelope cover version the nucleoacpsid and they are called enveloped viruses . The envelope is commonly of glycolipid and the lipid membrane itself and any carbohydrates present are raw legion-coded (The grippe virus and HIV use this strategy to bungle the resistive formationSince viruses use the machinery of a array cell to make and reside within the horde cell , they are annoyed to eliminate without killing the multitude cell . Viruses used antithetical mechanisms to evade the tolerant brass of the host cell . The close to commonly used strategies include antigenic variation , antigenic error and effort . Influenza virus uses both antigenic shift and antigenic drift to evade the immune schema .

antigenic variation can occur through scarlet tanager broadly defined genetic processes : gene mutation , recombination , and shift results in pathogens that are immunologically decided from the parental strains there by escaping the immune system of the host .antigenic shift involves between ogre different subtypes of the same virus coinfect a single cell and exchange RNA segments to form a new subtype . Antigenic drift is by ever-changing the surface protein mainly haemagglutinin and Neuraminidase proteins in case of influenza virus . Mutations in the RNA or DNA causes change in the surface protein and host immune system fails to identify the viral proteins and this will facilitate the viral persistence in the host cell and making it unvoiced to controlReferenceds Virology , David M .Knipe , Peter M Howley , Diane E Griffin , Robert A Lamb , Malcom A Martin , Bernard Roizman , Stephan E Stratus , Source Lippincott Williams Wilkins (LWW , fifth edn , 2007 . PAGEPAGE 1...If you want to get a full essay, order it on our website: Ordercustompaper.com

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