BIOL 215- Final Exam Guide - Comprehensive Notes for the exam ( 221 pages long!)

• School: McGill University
• Department: Biology
• Course: BIOL 215
• Professor: Ehab Abouheif

Document Summary

Size of sun - gives out right amount of radiation: orbital distance - provides just the right amount of heat and light. (moderately stable climate, mixture of elements - required for life. (carbon, hydrogen, nitrogen, oxygen, phosphorus, sulfur) Liquid water: ozone layer - protecting from uv rays. Iron core casting magnetic shield- keeps earth stable from harmful solar/cosmic radiation: earth"s structure, hydrosphere, continental crust. Second (4. 2-3. 8 bya): carbon dioxide/water vapor/methane: o2 cyanobacteria, ozone layer formation, consumption of co2, oxygen does not form until first signs of biological life. Laboratory reproduction: natural preconditions, only on earth, or elsewhere, rna/dna/proteins. Lectures will go from 4. 6bya to present (excluding humans) Prerequisites for the origin of molecules: our sun and the earth"s orbit. Stanley miller, 1953: used gases thought to compose earth"s early at(cid:373)osphere: i(cid:374) o(cid:374)e week had, 17 of 20 amino acids, purines/pyrimidines. Possible sites for origin of first molecules on earth: where do they come from, hydrothermal vents, thermophilic (heat-loving) organisms, volcanoes.