CAS BI 203 Lecture Notes - Lecture 1: Cell Nucleus, Rickettsia, Bacteria
Document Summary
How cells are studied - unity and diversity of cells. Macromolecules, metabolic processes, basic composition (i. e cell membranes) The ability to study one cell to learn about others is a key feature of cellular biology. Application of heat to various atmospheric molecules resulted in the formation of organic molecules such as various amino acids. However, this experiment never yielded nucleic acids. Nucleic acids formed by reactions of these various organic molecules. Proteins from spontaneous formations did not self replicate. Rna allowed for these proteins to replicate without having to go through a combustion reaction. Scientists demonstrated that rna has catalytic activity, showing that it could self replicate and form complementary base pairs. Rna based world that gave rise to living things. The first cell: self-replicating rna enclosed in a phospholipid membrane. Endosymbiosis hypothesis - first eukaryotic cell formed by merging of two prokaryotes.
