Biology 3593B Study Guide - Quiz Guide: Cell Nucleus, Streptococcus, Pus
Document Summary
A linear sequence of nucleotides along a segment of dna that provides the coded instruction for the synthesis of rna. The rna, when translated into proteins leads to the expression of a hereditary character. In 1869 miescher discovered dna as a distinct molecule, by collecting bandages and using their pus to isolate a new molecule, nucleic, from the cell nucleus of lymphoid cells. He determined that nucleic consists of hydrogen, oxygen, nitrogen and phosphorus and that there was a unique ratio of phosphorus to nitrogen. By 1920 scientists knew that chromosomes consist of dna and proteins. E: dna was dye stained and proved that dna was the genetic material because. E: s was covered by a polysaccharide capsule, protecting it from an attack by means of a host"s immune system. S cells were virulent and, when injected into mice, reproduced and caused pneumonia. R strain cells lacked the protective capsule and weren"t virulent, thus didn"t cause pneumonia.
