BI110 Lecture Notes - Lecture 7: Reducing Atmosphere, Polymerization, Cell Nucleus

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17 Jan 2018
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Seven characteristics of life: display order, harness and utilize energy, reproduce, respond to stimuli, exhibit homeostasis, growth and development, evolve. History of earth: first prokaryotes 3. 9bya (chem) and 3. 5bya(fossil, photosynthetic organisms, 2. 7bya, o2 increases in atmosphere 2. 5bya, first eukaryotes 2. 1-2. 2bya, earliest humans 150,000 - 200,000 bya. Formation of biologically important molecules: oparin-haldane hypothesis, organic molecules that form building blocks of life could have been formed in conditions that prevailed on primitive earth, reducing atmosphere that lacked oxygen. Polymers from monomers: key macromolecules of life, such as proteins and nucleic acids, are polymers that were not formed in the miller-urey experiment, polymerization rxns may have occurred on solid surfaces. Protocells: the first cells: protocells (or protobionts): group of abiotically produced organic molecules that are surrounded by a membrane or membrane-like structure. Ribozymes: rna molecules that catalyze speci c reactions, contains 3d molecule, rst real biological molecule was rna.

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