Identify the organism which differs from the other three organisms given in the options with respect to cell type.
Cells are of two types: prokaryotic and eukaryotic.
Prokaryotic cells lack a well-defined nucleus and membrane bound cell organelles. Clostridium is a prokaryote and it belongs to the kingdom Monera.
Eukaryotes are characterised by a well-defined nucleus and membrane bound cell organelles. Organisms belonging to the kingdom Protista, Fungi, Plantae and Animalia are eukaryotes.
Aspergillus, Saccharomyces and Monascus purpureus are members of the kingdom Fungi.