jueves, 5 de abril de 2012

La reproducción y la relacción de la s bacterias

Las bacterias se reproducen normalmente por bipartición , producciendo dos bacteria hijas .Cada bacteria hija crece hasta alcanzar el tamaño adecuado y vuelven a dividirse . El proceso es muy rápido .

Las bacterias interccionan con el medio en el que viven .Son capaces de captar variaciones  y responder a ellas .

Cuando las condiciones del medio no son favorables , algunas bacterias se rodean de una gruesa pared y forman esporas de resistencia . De esta forma  pueden soportar temperaturas elevadas , períodos de sequía , heladas  , etc 

Cuando las condiciones mejoran se desarrollan  una nueva bacteria a partir de la espora 


Las esporas son formas de resistencia
que permiten a la bacteria soportar condiciones
desfavorables
Una bacteria puede dividirse  cada 30 minutos


1 comentario:

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