Aspergillus is known as forming a group of fungi, aspergillus group, from where, as about 20 species from the approximately 185 contained by the group, are the basis of opportunistic infection in human.
The type of fungus cell is eukaryotic, but presents important differences from the rest of eukaryotes. One of the important difference consists in the structure of the fungus wall, which, unlike the other eukaryotes( where contains cellulose and pectin), contain chitin. Chitin is a polyssacharide, and could be seen as cellulose but with one hydroxyl group. Chitin has bee recognized as being an efficient provoker of the defending mechanism in plants.
Aspergillus, being a fungus, presents the peculiar way of vegetative growing, namely hypahe. Aspergillus have septate hyphae.
Having hyphae, it results that aspergillus is a multicellular organism, because only unicellulars (yeasts) doesn't have hyphae!
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