alloenzymes

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• Alloenzyme — Alloenzymes are common biological enzymes that exhibit high levels of functional evolutionary conservation throughout specific phylas and kingdoms. They are used by phylogeneticists as molecular markers to gauge evolutionary histories and… …   Wikipedia

• Multicellular organism — In this image, a wild type Caenorhabditis elegans is stained to highlight the nuclei of its cells. Multicellular organisms are organisms that consist of more than one cell, in contrast to single celled organisms. Most life that can be seen with… …   Wikipedia

• Conservation genetics — For molecular conservation in genetics see: conservation (genetics). For the scientific journal Conservation Genetics, see Conservation Genetics (journal). Part of a series on Genetics Key components Chromosome DNA& …   Wikipedia

• Evolution of multicellularity — The first organisms that existed are believed to have been unicellular. How organisms then became multicellular is a huge evolutionary step and is consequently under much debate. However, unlike some other huge steps in evolution,… …   Wikipedia

• Cerf élaphe — « Cerf » redirige ici. Pour les autres significations, voir Cerf (homonymie). Cerf élaphe …   Wikipédia en Français

• ANTIBIOTIQUES — Selon la définition donnée par S. A. Waksman, en 1941, un antibiotique est une substance produite par un micro organisme et qui a le pouvoir d’inhiber la croissance d’autres micro organismes en solution diluée et même de les détruire. L’antibiose …   Encyclopédie Universelle