BIO SCI 94 Lecture Notes - Lecture 5: Pathogenic Bacteria, Microbiological Culture, Nuclear Membrane

• School: UC-Irvine
• Department: Biological Sciences
• Course: BIO SCI 94
• Professor: Robin Bush

Document Summary

Prokaryotic is an adjective used to describe organisms that lack a membrane-bound nucleus. Lineages in the domains bacteria and archaea are ancient, diverse, abundant, and ubiquitous. Eukaryotes don"t appear in the fossil record until 1. 7 billion years later. Bacteria, archaea, and eukarya share subsets of characters with one another. Microbe - any microscopic organism including bacteria, archaea, and various tiny eukaryotes. Only tiny fraction of bacterial species living on and in human body are pathogenic. Pathogenic bacteria tend to affect tissues at the body"s entry points. Koch"s postulates (1985) used to confirm a causative link b/w a specific infectious disease and a specific microbe. Microbe must be present in individuals suffering from the disease and absent from healthy individuals. Organism must be isolated and grown in pure culture away from host organism. If organisms from the pure culture are injected into a healthy experimental animal, the disease symptoms should appear.