In my hand I hold yeast, a eukaryotic microorganism. A eukaryote is an organism whose cells are composed of many organelles, especially a nucleus. Without a nucleus an organism would be declared a prokaryote because it would be a simpler cell that holds its genetic information out in the cytoplasm. Although the organisms of yeast are small, they are still eukaryotic because they have complex cell structures. They are composed of organelles and have a nucleus where the genetic information is held. Therefore, the yeast is a eukaryote.
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