01:119:101 Lecture Notes - Lecture 12: Microparticle, Ammonia, Surface 3
12 Jul 2015
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Bio lecture 12 10/11/12 chapter 21 origin of life. Formation of polymers: organic polymers can form on clay or rock surfaces (negative ions) attract and bind monomers. Lab amino acid solutions, drip onto hot rocks, amino acids join together to form polypeptides. Able to produce an electrical potential across surface. Osmotic swelling and shrinking (water can go in and out) Able to maintain an internal environment that is different from the external environment. Divide in half: no mechanism of heredity. Living cells: metabolism first hypothesis, chemical reactions between simple molecules occurred in an enclosed space, able to use source of energy drive reactions. Different than external: pre-cell organized growth, eventually developed ability to reproduce (fig 21-4, origin of heredity, living cells, genetic information dna i. ii. Dna is transcribed into mrna mrna is translated into proteins iii. Idea that prebiotic earth gave rise to rna molecules that were capable of two critical activities i. ii.
