lecture02 - 20.106J Systems Microbiology Lecture 2 Prof...

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20.106J – Systems Microbiology Lecture 2 Prof. DeLong ¾ Reading for next week: Chapter 5 (Biol. Energy, Couscku) ¾ Problem Set #1 due next week ¾ Reading for today: Purcell, Berg, and Pace Related to the last lecture: o Life’s history on Earth – Evidence Phylogenetic tree The same machinery for making proteins – with ribosomes – is used all over Earth. You can map how different the ribosomal RNA is in each species on Earth. In this way we can compare microbes to eukaryotes. A lot of the Eukarya tree (our own tree) is dominated by microbes – Archaea. Chloroplast RNA falls right next to cyanobacteria on that tree This supports the endosymbiont hypothesis – chloroplasts derive from cyanobacteria. Similarly, mitochondrial RNA falls by agrobacteria – α proteobacteria. o Life on Earth today: the foundation CO 2 /O 2 cycle To be covered today: Structure, Function, Motility o The nature of being small o Cell membranes and cell walls o Flagella Shape and Appearance – not where the interesting stuff is regarding microbes o They don’t bring in solid food – they bring in dissolved substrates.
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