Microbes and unicellular organisms. Bacteria include anthrax (Bacillus anthracis), Plague (Yersinia pestis), Donovanosis (Klebsiella granulomatis ), Chlamydia, & Syphilis (Treponema pallidum). There is a general bacterial cell structure image and bacterial cell wall structures. Important protists include as Amoeba, Paramecium, and Euglena. Yeast (Candida albicans) and the freshwater alga Volvox. The parasites Cryptosporidium and Giardia are also featured.