Unicellular Organisms

Pre-IB Biology 26.11.2009

Unicellular organisms Any organism which carries out all the functions of life with the help of one cell

Division  Protists  Protozoans (prvoci)  Plantae  Fungi

Kingdom Protist Protozoans  Some of them are parasitic – 60%  Freely living – 40%  Very dangerous for pregnant women • E.g.(Toxoplasma Gondi) ○ Quite common – many people are its vectors • Fly tse tse – the vector for sleeping sickness ○ Phylums  Phylum Sporozoans (výtrusovci)  Phylum Ciliophora (nálevníci)  Phylum Rhozopoda (kořenonožci)(Amoeboid protozoan)  Phylum Zoomastigophora (živočišní bičíkovci)(Flagellate protozoan)

Sporozoans – Apical complex

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 no organelles for movement  composed of many parts ○ Rhoptry – attach the host cell and penetrate it is All parasitic organisms are very simple – exploits the components of the host cells ○ Conoil – it is to penetrate the host cell’s membrane ○ Polar rings – hold all the parts of Apical complex together ○ Micropore – its functions is to bring some kind of water