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biologiaaa

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by

Martha Arey

on 21 December 2010

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Transcript of biologiaaa

BACTERIAS ¿Que es una bacteria? son los organismos mas pequeños. estan en todas partes una bacteria es una celula se adaptan a las variaciones ¿que papel han desarrollado? las primitivas vivian sin oxigeno el oxigeno les era toxico 3 familias de organismos las primeras bacterias conocidas la segunda bacterias atipicas la tercera las celulas eucariotas ¿son indispensables para la vida? lo mas escencial en la tierra saprofitas = reutilizable el nitrogeno elemento escencial de la materia ¿difieren de las demas celulas? procariota=levadura de animales eucariota= membrana, cromosomas la procariota= un cromosoma ¿como se multiplican? se reproducen siguiendo un modelo temperatura varia segun el lugar la presencia del oxigeno es escencial
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