n nso WE SEE'REu u u u u uwhy do cells matter uEifebeginsatthecellularlevelafthoughmicroscopicacellcontainscomplexmachinarycapableofsupportingalloflife'sprocessesanystudyofbiologycanthereforebenefitfroman examinationofcellularstructuresthe microscopic world of cellsmicrographsphotographstakenofmicroscopestightmicroscopescanmagnifyuptoabout ooocooeeelectronmicroscopesusebeamsofelectronsratherthaneightandcanshowobjectsabouttootimessmallerthaneightmicroscopesorganismsareeithersingleawedhsuchasprokaryotesandprotists ormulticellularlikeplantsanimalsmostfungiourbodiesare a cooperativesocietyoftrinionsofmanofmanyspecialisedtypesthecelltheorystatesthatareairingwingsarecomposedofcellsandthatallcellscomefromearlieraus everycueinyourbodyandineveryotherlivingorganismonearthwasformedbydivisionof a previouslylivingneebiologistsclassifyalllifeintotruemajorgroupscaneddomainsoiganismsofthedomainsbacteria archaeaarecomposedofprokaryotic au prokaryotes organismsofthedomainEukarya includingprotistsplantsfungiandanimalsarecomposedofeukaryoticcells eukaryotes Everyorganismthatyoucansee4yourowneyesisaeukaryoteI 2V IP C GORIESofcues I EsteemE e e gachromosomes aretightlyDNAistheselfreplicatingmaterialpresentinnearlyweareerring coiledbundlesofDNAandorganisms it isthemainconstituentofchromosomesandthe proteinfoundinthemiccarrierofgeneticinformation lensofmostlivingcellsAproteinlinedchannelin thenuclearenvelopethatregulatesthetransportation ofmoleculesbetweenthenucleusand the cytoplasm is called a nuclearporeThenucleus in the mostprominentmembrane bound thesoundbodythat sitsorganelleineukaryoticcans ithousesmostofmeeee'sDNA insidethenucleusofaeukaryoticau andmakersibosmaeThenuclearenvelope isthetwolayeredmembranethatencasesthenucleus subunitsfromproteinsandribofaeukaryoticcell separatingthenucleusfromthecytoplasm osmaeRNAisknownasthenucleolusRNA in and in allstepsofproteinsynthesis andcarriesthegeneticinformationofmanyviruses
