BIO120H1 Lecture Notes - Atlantic Horseshoe Crab, Red Algae, Aequorea Victoria
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BIO120H1 Full Course Notes
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Classifying living organisms: number of species known to science is approximately 1. 8 million, to name organisms, biologists use a multilevel grouping of individuals: classification, organisms were first classified more than 2,000 years ago by aristotle. The father of taxonomy: binomial nomenclature, hierarchical system of classification: large groups share general characteristics, and small groups share many characteristics. Higher categories: taxonomists use a hierarchical system to classify organisms. Classifying the diversity life different approaches to classifying living organisms. 1. 10 three domain system bacteria - prokaryotes archaea - prokaryotes eukarya - eukaryotes 2. Bacteria and archaea: form two of the three domains of the tree of life. Found on every square centimeter of the earth"s surface, even inside deep sea vents, far underground, and in clouds. 1 gram of soil has > 10,000 bacterial types; billions of cells. 500 species of prokaryotes live in your mouth. 1014 bacterial and archaeal cells live in your stomach and intestine.