BIO 1130 Lecture Notes - Lecture 9: Sulfur, Enterobacteria Phage T2, Bacteriophage

• School: University of Ottawa
• Department: Biology
• Course: BIO 1130
• Professor: Jon Houseman

Document Summary

Unusual substance "nuclein" which is now called dna (deoxyribonucleic acid: molecule that is the geneic material of all living organisms & exinct organisms as well. Proteins contain 20 types of amino acids nucleic acids have 4 diferent nitrogenous bases available for coding. Scienists believed that nucleic acids were the hereditary molecules. 12. 1a experiments began when griith found a substance that could geneically transform. 1928 frederick griith (briish medical oicer) experimented with bacterium. Streptococcus pneumonia which causes form of pneumonia in mammals and made interesing observaions. While trying to make vaccine to prevent pneumonia infecions in epidemics that happened ater wwi. Used 2 strains of bacterium - s - smooth strain, has polysaccharide capsule surrounding each cell and forms colonies that look smooth and glossy on a culture plate. When injected into mice, it was very infecive or pathogenic, causing pneumonia and killing mice in day or two.