All fungi have a cell wall made of chitin. Mushrooms and moulds are examples of multicellular fungi and yeast is an example of a unicellular fungi. There are two major groups of protists which include the Protozoans, whose cells are similar to animal cells in that they do not have cell walls and the plant-like cells which do have cell walls and are similar to algae.įigure 9.9: Diatoms from Antarctic sea ice.įungi are eukaryotic organisms that can be multicellular or unicellular. Important examples of protists include the organism known as Plasmodium (which causes malaria), Amoeba and Euglena. Protista are eukaryotic and can be unicellular or simple multicellular. Staphylococcus aureus bacteria can cause skin infections, sinusitis and food poisoning. Mycobacterium bacteria that causes Tuberculosis. The human body also contains \(\text\) times as many bacterial cells as human cells! In a single gram of soil, there are about 40 million bacterial cells. Living things can be classified into five major kingdoms:īacteria are found everywhere and are the most numerous organisms on Earth. Whittaker in 1969 and was built on the work of previous biologists such as Carolus Linnaeus. The five-kingdom system was developed by Robert H. Modern technologies such as Genetics makes it possible to unravel evolutionary relationships to greater and greater detail. Classification systems are always changing as new information is made available. The five kingdom system is the most common way of grouping living things based on simple distinctive characteristics. The current system was developed by Robert H. Modern technologies such as electron microscopy make it possible to observe microscopic organisms in greater detail. In this section learners are introduced to the most common way of grouping living organisms based on simple distinctive characteristics.
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