Biology 1002B Lecture Notes - Lecture 10: Electrochemical Gradient, Thermoproteus, Thermotoga
10 Feb 2016
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False assumption: people still talk about prokayotes as if they are a single group with a common ancestor (bacteria and archaea) False: they have similarities because descended from common ancestor they are very diferent. Don"t actually share a common ancestor archaea: in some ways more similar to eukaryotes than bacteria prokaryotic cell structure neither have nucleus neither have organelles lots of things they don"t have lack morphological complexity. Humans have 20 diferent types of cells (complexity) Eukaryotes have a higher morphological complexity than archaea and bacteria. Have been around as long as other domains of life. Have had 4 billion years to get evolution done. Something else prevents this, they have had enough time. Archaea and bacteria are, however, biochemically diverse, they still have complex pathways that lead to unique molecules. Can live in extreme environments that eukaryotes can"t. Recombination, introns and exons, nucleus-like structures, dynamic cytoskeleton, intercellular signalling, endocytosis. Some prokaryotes have some of these functions (1 or 2)
