Algae
Simple photosynthetic organisms. Algae may be
composed of a single cell, a filament of cells, or a flat plate of
cells. Cell walls of algae are made of cellulose. Algae have some
characteristics of animal cells. With the exception of the red
algae, most algal cells have centrioles. During cell division, most
algal cells form a cell furrow like those in animal cells.
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