01:119:115 Lecture Notes - Lecture 4: Red Algae, Phanerozoic, Cambrian Explosion
27 Sep 2016
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Small organic molecules formed spontaneously combined to form b. i. 2. Droplets with membranes that could maintain in internal environment different from surroundings b. i. 4. Eventually lead to inheritance: 4 requirements c. i. Thunderstorms / volcanic activity / meteorites / radiation c. i. 3. H2 / n2 / co / nh3 / ch4 c. i. 4. Earth is about 4. 6 billion years old c. i. 4. b. Formation of small organic molecules: oparin holdane hypothesis a. i. Conditions of early earth favored spontaneous formation of simple organic molecules a. iv. 1. a. (sugars, amino acids, lipids, nucleic acids, etc. ) a. iv. 1. b. Designed closed apparatus to simulate supposed conditions of early earth a. iv. 2. c. Electrical sparks simulate lightening e source a. iv. 2. d. i. Regardless able to produce organic molecules a. v. 1. c. All amino acids / all nucleic acids a. v. 1. d. Hypothesis suggested that organic molecules accumulated in the oceans and over long period of time a. v. 2. a. Life formed at cracks of the ocean floor b. ii. Hot h2o, co, minerals, iron sulfides, nickel sulfides.
