BIO 1140 Lecture Notes - Lecture 4: Lipid Bilayer, Murchison Meteorite, Starch
25 Feb 2016
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Lec 4 : macromolecules and chemistry of the cell (jan 22) Seven characteristics of life : display order (arranged in a highly ordered manner, cell is fundamental unit) 2. harness and utilize energy (acquire from enviro, use it to maintain ordered state) 4. respond to stimuli (response to change in external enviro) 6. grow and develop (increase size by increasing number of cells) 7. evolve (change over time to better adapt to their enviro) emergent properties : emerge from many simpler interactions that in themselves do not have the property of life. *virus not biotic, because can"t synthesize their own proteins. Chemical origin of life : cells come from pre-existing cells. All components of solar system were made at the same time. Formed by gravitational condensation of matter in interstellar cloud (hydrogen mostly) Situated in habitable zone (heat from sun allows water to exist in liquid state) Habitable zones depend on energy output of suns. Hypothesis 1 : reducing atmosphere (oparin and haldane)
