BIOL1012 Lecture Notes - Lecture 8: Protist, Transfer Dna, Monera

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The diversity of life: 3. 8 billion years of evolution have shaped the diversity of life that exists on the planet today. Figure 26. 21: recently, we have gained insight into the deepest branches of the tree of life through molecular systematics, early taxonomists classi ed all species as either plants or animals, later, ve kingdoms were recognized: monera (prokaryotes), Protista, plantae, fungi, and animalia: more recently, the three-domain system has been adopted: Important for today, prokaryotes account for two of the three domains of life. Heat tolerant prokaryotes; geyser in nevada: the human gut - delicate balance between hundreds of species of bacteria and archaea, but these bacteria are essential to a healthy body! They aid in the normal digestion and absorption of nutrients: the human fetus has a sterile gut, but breast milk has. Photo = energy from light; chemo = energy from molecules. Organizations: coccus, bacillus & spiral, temporary (reversible) or permanent aggregates/colonies.

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