BIOL 3200 Study Guide - Final Guide: Microtubule, Cyanobacteria, Tetrahymena
Document Summary
Central dogma and the origins of life : dna rna protein cell . Washed pus cells (later salmon sperm) in very dilute hydrochloric acid to remove the cytoplasm. He then ltered out the nuclei without cytoplasm. Called the stuff nuclein because it was in the nucleus, --still in the world nucleic acid today: the molecular approach to the gene involved a merger of several techniques. Chromatography used to analyse the composition of dna and proteins. X-ray crystallography reveal the 3 dimensional structure of proteins and dna. Gene would have to be a complex molecule. Dna was thought to be a monotonous polymer like starch with repeat sets of four nucleotides followed in a xed ordered: agct agt. It seemed as if there were equal amounts of agct present in the. Complex, diverse- the most important molecules in the cell. By 1940s, proteins shown to be made up of about 20 amino-acids in chains from 100s to 1000s.
