BI236 Lecture Notes - Lecture 1: Theodor Schneider, Archaea, Cell Theory
Document Summary
Grow, reproduce, process information, respond to stimuli, communicate, carry out chemical reactions. Formally established by theodor schneider and matthias schwann in 1839, cell theory (or cell doctrine) The cell is the structural functional unit of all living things. All organisms are composed of one or more cells. New cells come from pre-existing cells; lifeforms today have descended in unbroken continuity from the rst primitive cells that arose on earth more then 3. 5 billion years ago. Hereditary information passes from parent cell to child cell. All cells have the same basic chemical structure. The fundamental biochemical reactions of life take place within cells. Some cells are visible to the unaided eye. The smallest objects that are unaided human eye can see are about 0. 1 mm long. Ex: amoeba proteus, a human egg, and a paramecium. Single celled organisms > multi cell organism. Bacteria is a prokaryote because it doesn"t have an organized nucleus.
