BIO 101 Chapter Notes - Chapter 13: Streptococcal Pharyngitis, Probiotic, Acne Vulgaris
4 Mar 2016
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Not all microbes are closely related evolutionarily (13. 1) Microbe- a microscopic organism; not a monophyletic group, since it includes protists, archaea, and bacteria. Microbes are grouped together only because they are small, not because of evolutionary relatedness. They occur in all three domains of life and also include the viruses, which are not included in any of the domains. Microbes are the simplest but most successful organisms on earth (13. 2) Microbial species live in almost every habitat on earth; among them, they can eat almost anything. Microbes are very small, simple organisms, but they do everything that larger, multicellular organisms do. They can live anywhere, from moderate to extreme environments. There are millions of different kinds of microbes on earth, in enormous numbers. Microbes in the three of life: domain bacteria, domain archaea, domain eukarya. Bacteria are single-celled organisms that lack a nucleus. Bacterial species are commonly classified by their shape:
