Notes mid 2

Notes mid 2 - Notes, Midterm 2 Abiogenesis How might the...

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Notes, Midterm 2 Abiogenesis - How might the first macromolecules have arisen? - Miller-Urey Experiment (1953) – tried to simulate conditions like those of the ocean’s edge on early Earth (reducing atmosphere etc) o formed more complicated molecules (like hydrogen cyanide, formaldehyde, formic acid, urea) from very simple ones, like methane, water, carbon dioxide - other scientists have since produced all 20 amino acids, lipids, purine/pyrimidine bases, and ATP - Hypothesis: life developed from non-living materials that became ordered o 4 stages 1. Abiotic synthesis and accumulation of small organic molecules 2. Joining of monomers into polymers 3. Aggregation of molecules into droplets – protein or lipid based 4. Origin of heredity – probably RNA - Early Earth – reducing atmosphere, high UV radiation, volcanism, lightning may all have contributed to the synthesis of organic molecules - Alternative: o Oxidized atmosphere and sunlight organic molecules o Redox reactions at hydrothermal vents Kinetic energy from interior of earth
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Notes mid 2 - Notes, Midterm 2 Abiogenesis How might the...

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