生物专业英语PPT

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1、cellsTwobroadgrouupsofcell:CellTypes*Prokaryotic:nomembraneboundorganellesex.bacteria*Eukaryotic:membraneboundorganellesex.AnimaiandplantYOURSITEHEREProkaryoticcells:※Mostprimitive,earliestformoflife※Donothaveapre-definednucleus※Chromosomesaredispersedinthecytoplasm※Containnomembrane-boundo

2、rganelles※Smaller(70S)ribosomesYOURSITEHEREEukaryoticcells:※Morecomplex,evolvedorgansims※Containtruenucleiinwhichchromosomesarecompactedaschromatin※Containmembrane-boundorganelles※Larger(80S)ribosomYOURSITEHERE4differencesbetweenthem-Plantcells:*cellwall*chloroplasts*largecentralvacuole-A

3、nimalcells:*centriolesEUKATYOTICCELLS:2MaintypesofEukaryoticcellsAnimalandPlantcellsYOURSITEHEREYOURSITEHEREProkaryotesEukaryotesTheyaremainlyunicellularTheyaremainlymulticellularexceptforprotistaTheyhaveonlyafeworganellesManyorganellesDNAiscircularDNAislinearDNAliesinthecytoplasm(Nucleusa

4、bsent)DNAisinsidethenucleusCelldivisionoccursmostlythroughbinaryfissionMitosis,meiosisorbothtakeplace.YOURSITEHEREYOURSITEHEREThankYou