BIOL 1201 Lecture : Lectures 1- 3
Document Summary
How did life begin: 4. 1 billion years ago, octan"s razor- simplest explanation, hypothesis is based on an educated guess, no evidence to suggest that life began anywhere else, 6 million plus species on the planet today. A few centuries ago: people thought that new living things appeared all of the time. Mid- 1800s louis pasteur: broth in flask is boiled to kill preexisting microorganisms, as broth cools, condensing water collects, sealing the mouth of the flask. Earth before life arose: earth is about 4. 6 billion years old. The experiment of miller & urey: discovered the idea that life spontaneously develops, 1950s they were not able to support their hypothesis. How to assemble a living thing: accumulation of organic molecules, catalyze reactions, reproduce from stored genetic info. Lectures 1-3: separate the living thing form the outside environment. Rna molecule that can catalyze reactions, especially those involved in synthases and processing.
