Protista (Protistes) by claude19

Fractal • Science Fiction • posted on Dec 09, 2008

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Description

Les protozoaires sont des organismes unicellulaires qui forment un groupe paraphylétique, ils possèdent une cellule eucaryote (c'est-à-dire possédant un vrai noyau, contrairement aux bactéries, dites procaryotes), très différenciée qui remplit de nombreuses fonctions nécessaires à la vie et comportant des organites complexes : "vacuoles pulsatiles", "cils", "flagelles". Les protozoaires se différencient donc fortement des cellules constituantes des tissus des métazoaires. Ils ont conquis et se sont adaptés à tous les milieux de vie, et certains sont des parasites qui peuvent être dangereux. Leur reproduction sexuée ou asexuée est très complexe. The protozoa are unicellular organizations which form a group paraphyletic, they have a cell eucaryote (it be-with-to say having a true core, contrary to the bacteria, known as procaryotic), very differentiated which fills of many functions necessary to the life and comprising complex organoids: "pulsatile vacuoles" , "lashes" , "whips". The protozoa are thus different strongly from the constituent cells of fabrics of the metazoaires. They conquered and adapted to all the mediums of life, and some are parasites which can be dangerous. Their sexual or asexual reproduction is very complex.