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Cell four principle parts1.plasma cell membrane .cytoplasm.organelles
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4.inclusionsPlasma cell membrane has four basic functions1.separates ECF from ICF.facilitates contact with other body cell or foreign cells.provides receptors for chemicals4.mediates entrance and exit of materials Proteins in cell membrane have a five of functions1.structural support.transport molecules across membrane.enzymatic control of chemical reaction at cell surface4.receptors of hormones5.cell markersSelective permeability function of four factors1.size of molecule.solubility in lipids.charge on ions4.presence of carrier moleculesPassive1.Simple diffusion.Facilitated diffusion.osmosis4.dialysis5.filtrationFacilitated diffusion three things determine how fast1.difference in concentration.numbers of carriers available.speed of carriersIsotonicSame concentration of solute as ICFHypotonicLower conc. of solute than ICF, cells will burstHypertonicHigher conc. of solute than ICF, cells will shrinkFiltration things for how fast1.Gravity.Mechanical .hydrostaticActive process1.Endocytosis.exocytosis.carrier medicated transportEndocytosis ways1.phogocytosis- cell eating, projections, form vesicle, and gets digested.pinocytosis-cell eating, envaginates on itself, forms vesicle, and gets digested.receptor mediated endocytosis- ligind bonds to receptor, forms vesicle and vesicle forms to vesicle and forms endozome, endozome forms to endosome, and forms curl and curl lets go of ligind and gets digested.Carrier medicated transport, carries have three basic characteristic1.specificity.competition.saturationResting membrane potential voltage-65 85mVVoltageA potential across plasma cell membraneTwo types of chromatin1.Euchromatin- active form in non dividing cell.Heterochromatin-inactive form in non dividing cellTwo types of ER1.SER-serves as a site for enzymes reaction.RER- found in cells that are active secretors of proteinER works hand in hand with golgiProteins produces at the rivosomes of the RER enter the ER and then are surround by a vesicle called a transport vesicle and get thrown to the golgi, fuses with golgi and releases protein into the cis cisternae, gets motified and buds off to the medial cisternar,gets motifed and buds off into the transfer cisternae and forms a secretory vesicule and leaves the cell through exsocytosis but if it does not leave it forms lysosomes.Two organelles involed with ensomatic activity1.lysosomes-breaks down molecules, self digests known as autophase.mitochondria- powerhouse, where ATP is made, outer membrane is smooth and inner membrane our arrange in series of folds called cristae, central area known as matrix, all cell bur machor red blood cells, and have own DNALysosome goes through stages1.Primary stage- fuse with another organelle. Secondary stage- contains partically digestive reminants. Residual body- contains undigestive wasteCentrosomeDense area of cytoplasma close to nucleus, contain centrioles, centriols contan micro-tubules, in bundles of threeComposed of cyto skeleton1.microfilaments.microtubules.intermediate filamentsInclusionsChemical substance that are produce by the cellMelanineGlycogenLipidsMucusYou know when a cell is going to dividecGMP goes downcAMP goes upEvery cell goes through a cell cycleInterphase G-1-growth s-synthesis, DNA is replicated G- growth preparing for mitosis M-mitosis phaseProphaseMetaphaseAnaphaseTelephaseCell division two basic events1.Karyoleinesis- nuclear diviosonMitosisMeiosis.Cytoleinesis- cytoplamic divisionDNA is made up of sequence of nuclear tides arranged in a double helixNirogenous baseA-TT-AC-GG-CSugarPhosphateA and G ringsT and C one ringGentic codeSequence of Nitrogenous baseHow replication happens 5Initiatior proteins- start thing to happenHelicases- emsymes, brake down h+ bonds between NB to open up helixTopoisomerase- form replication bubble and brakes strain and allows to uncoil, reattaches ends and keep apartDNA polymerase bring in appropate NB, sugar and PhosphateFour basic types of RNA1.pre-m-RNA.m-RNA-messenger RNA, contains code.T-RNA- transfer RNA, decodes message4.r-RNA-ribosomal RNA, forms part of structure of ribosome and genes for it synthesisRNA sequence of NTA-UU-AC-G Please note that this sample paper on cells is for your review only. In order to eliminate any of the plagiarism issues, it is highly recommended that you do not use it for you own writing purposes. In case you experience difficulties with writing a well structured and accurately composed paper on cells, we are here to assist you. Your persuasive essay on cells will be written from scratch, so you do not have to worry about its originality.
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