Biology 1202B Lecture Notes - Lecture 1: Craig Venter, Electron Microscope, Synthetic Biology
Document Summary
All organisms are composed of one or more cells. The cell is the basic structural and functional unit of all living organisms. Cells arise only from the division of pre existing cells. All cells contain highly organized systems of molecules, including the dna and rna which carry hereditary information. Cells use chemical molecules or light as energy sources for their activities. They respond to changes in their external environment by altering their internal reactions. Some types of organisms are unicellular, such as bacteria, fungi or protists. And some are more complex multicellular organisms, these include animals and plants. There are 3 different domains: bacteria, eukarya and archaea. The domain prokaryotes is no longer considered to be accurate as bacteria + archaea are not evolutionary related. Focus of the course is mainly bacteria and eukarya. Our bodies are made up of bacterial and eukaryotic cells.