BIOS 101 Lecture Notes - Lecture 16: Francesco Redi, Louis Pasteur, Archaea
Document Summary
Cell theory, all organisms composed of 1 or more cells, basic living unit of organization, all cells arise from preexisting cells i. ii. 16th century biologists believed life could arise from nonliving: known as spontaneous generation. Hypothesis rejected: francesco redi (1621-1697, meat jar with maggots experiment iii. Louis pasteur (1822-1895: milk pasteurization bacteria under microscope, all cells, bounded by cell membrane (plasma)- seperate internal contents from external environment, contain dna- genetic material -directs cell activity and enables reproduction, contain cytoplasm composed of: i. ii. Semi fluid material= h2o, ions, and organic molecules. Organelles (eukaryotic only) and structures: contains ribosomes= structures on which proteins synthesized, classification of cells based on structure, 2 types of cells: prokaryotic and eukaryotic i. ii. Every organism is composed of only one of these cell types: 3 domain classification system: prokaryotes, domain bacteria i. True bacteria, cyanobacteria: domain archaea, eukaryotes, domain eukarya, prokaryotic cells i. Prokaryotic organisms are classified in 2 domains: i.
