BIOL 101 Lecture Notes - Lecture 4: Endoplasmic Reticulum, Scanning Electron Microscope, Electron Microscope
Document Summary
Biology chapter 4 a tour of the cell. Cell theory all organisms are composed of one or more cells. Cells the basic living unit of structure and function in organisms. Theodore schwann zoologist, animals made of cells. Mathias schleidan all plants made of cells. Rodulf virchow extended cell theory, cells arise from pre-existing cells no spontaneous generation. They cannot be seen without a microscope, but there are exceptions like chicken cell. Logistics of carrying out cellular metabolism sets limits on sell size. If cells are small, the surface area to volume is greater. Therefor rate of reactions is faster and exit of waste products is faster. Cell sa/v ratio decreases because of this the amount of reactants coming in is less. A cell can only increase to a certain extent. For an organism to: grow, reproduce, repair. Metabolism- building and breaking up chemical reactions in the cell. Depends on: volume of the cell (space enclosed by plasma membrane)
