BIOC17H3 Lecture Notes - Lecture 1: Ernst Haeckel, Monera, Carl Woese

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Early scientists distinguished microbes based on their shape, size, attachment patterns: microbes can form multicellular colonies, and this accumulation can be seen without the use of microscopes. Antony leeuwnhoek: first person to make microscopes, he was the rst to look at microorganisms and called them animacules, challenge: where do microbes t in the hierarchy of living things. The aristotle hierarchy was plants, then animals and then humans at the top. Ernst haeckel developed the tree of life: he placed protista in the middle of plants and animals, so microbes are neither plants, nor animals, the grouping of organisms into three kingdoms was based on morphological features. Then the development of better microscopes, electron microscopes advanced our knowledge in cell biology: cellular organization lead to division of organisms into prokaryotes and eukaryotes. Prokaryotic cells lacked membrane bound organelles or membrane bound nuclei. Five kingdom tree of life: so then the microbes were divided into prokaryotes (called.

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