Biology 1002B Lecture Notes - Lecture 12: Base Pair, Noncoding Dna, Phos
16 Feb 2017
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Vastly more complex: plants have leaves, stems, fruits. , animals walk & talk & build tools. It"s not that bacteria didn"t have enough time to gure complexity out. They"re just simple, and they"re old (been around for billion of years) Bacterias are older than humans, yet they are way more simple. Within a single cell, eukaryotes: dna recombination, introns axons, nucleus, cytoskeleton, endomembrane system, intercellular signalling, endocytosis, these are the interactions b/w many different enzymes. It"s not that bacteria don"t do cool things (ex: extremophiles) and they also have biochemical pathways, they can make cool molecules: but those biochemicals do not interact in the same way eukaryotes do. Eukaryotic cells are much bigger, much more complex. Earliest bacteria were anaerobic (no oxygen in atmosphere) Cyanobacterias came along 2. 2 bya, rst sign of oxygenic photosynthesis, led to the rise of o2 in atmosphere.
