BISC 102 Lecture Notes - Lecture 4: Allan Hills 84001, Murchison Meteorite, Hydrogen Sulfide

• School: Simon Fraser University
• Department: Biological Sciences
• Course: BISC 102
• Professor: Ivona Mladenovic

Document Summary

Homeostatic: metabolism, nutrient uptake, nutrient processing, waste elimination, generative processes, growth and reproduction (replication, responsive processes. Immediate responses to environment: control processes, coordination, regulation, structural organization, cellular level, organismal level, bilateral symmetry 2 arms 2 legs, repeated patterns. First idea of the origin of life: spontaneous generation. Proposed by aristotle (4th century bc: (cid:862)li(cid:448)i(cid:374)g orga(cid:374)is(cid:373)s arise spo(cid:374)ta(cid:374)eousl(cid:455) fro(cid:373) (cid:374)o(cid:374)-li(cid:448)i(cid:374)g (cid:373)atter. (cid:863) Evidence: maggots are formed from dead meat, mice develop in darkness from wheat seeds, lice are the product of sweat, frogs are made from damp mud. Alternative idea: biogenesis (cid:858)life ca(cid:374) o(cid:374)l(cid:455) origi(cid:374)ate fro(cid:373) pre-e(cid:454)isti(cid:374)g life(cid:859). Accepted as the most plausible explanation only in 1861. The current (cid:858)co(cid:374)se(cid:374)sus(cid:859): chemical evolution (but where did it all start?) Energy source + raw materials + suitable environment. Different atmosphere: water vapor, nitrogen, carbon dioxide, methane, ammonia, hydrogen, hydrogen sulfide. As earth cooled: water vapor condensed, hydrogen escaped. Elements present on earth: c h n o p s, et sources.