BISC 120Lg Lecture 12: Introduction
21 Mar 2016
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Document Summary
Organismal biology: survey of diversity of life on earth cover microscopic and macroscopic organisms: how organisms interact with each other, bacteria interacting with antibiotics, viruses such as hiv. Exploration of ecological relationships: keystone species holds together ecosystem. Once bacteria enters wrong place, develop health problems. Antibiotics: naturally occurring chemical substances produced by bacteria, fungus, or any other type of microbe: ex: bacteria penicillium produces penicillin. When penicillin treats e. coli, the bacteria pops . R plasmids carry genes for antibiotic resistance. Antibiotics kill sensitive bacteria, but not bacteria with speci c r plasmids. Through natural selection, the fraction of bacteria with genes for resistance increases in a population exposed to antibiotics. Antibiotic-resistant strains of bacteria are becoming more common. Antibiotics will only kill bacteria that are very sensitive. Non-sensitive bacteria continue to produce [could develop into resistant population] Apply the antibiotic again, probably will not have any effect on bacteria. Proteins are made from genes in a cell.
