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Key words 4.docx

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University of Ottawa

Key words 4 Proterozoic Eon92 organization92 axoneme found in both flagella and motile cilia undulopodiais characteristic of the core of the eukaryotic flagellum called an axonemeAlternation of generationsis a term primarily used to describe the life cycle of plants A multicellular sporophyte which is diploid with 2N paired chromosomes ie N pairs alternates with a multicellular gametophyte which is haploid with N unpaired chromosomes Ameboid Amoeboid movementis a crawlinglike type of movement accomplished by protrusion of cytoplasm of the cell involving the formation of pseudopodiaThe cytoplasm slides and forms a pseudopodium in front to move the cell forwardAntibodyis a large Yshaped protein produced by Bcells that is used by the immune system to identify and neutralize foreign objects such as bacteria and viruses The antibody recognizes a unique part of the foreign target called an antigenAntigenThere is a set of proteins referred to as the H and N antigens embedded in the envelope of the virusan antigen is a substance that evokes the production of one or more antibodiesAsexual reproductionis a mode of reproduction by which offspring arise from a single parent and inherit the genes of that parent only it is reproduction which does not involve meiosis ploidy reduction or fertilization The offspring will be exact genetic copies of the parent Bacteria EubacteriaBacteria were among the first life forms to appear on EarthSingle celledBacteriophageViruses that invade bacteria are nonenveloped bacteriophages and they attach to the surface of the bacterium and inject their genome DNA or RNA in retrovirusesis any one of a number of viruses that infect bacteriaBasal bodyis an organelle formed from a centriole and a short cylindrical array of microtubulesflagellum consist a bundle of microtubules and at the base a structure basal body that builds themBikont is a eukaryotic cell with two flagella It is a division of eukaryotesCapsid proteinThe viral genetic information contains the genes required to duplicate the viral genome manufacture the capsid proteins and assemble the capsid around the copies of the genomeA capsid is the protein shell of a virusCellular glidingCentrioleA centriole is a cylindricallyshaped cell structure1 found in most eukaryotic cells though it is absent in higher plants and most fungiThe walls of each centriole are usually composed of nine triplets of microtubules protein of the cytoskeletona triplet of tubules and a pair at right angels that spiral around the core1shows up in mitosismade from proteins microtubular organizing unitthe centriole and the moles going around it are the microtubule generating site completely controls not only its composition but the microtubules around itCentrosomes
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