Sept 4-08 - Origin and Evolution of Life Lecture

Sept 4-08 - Origin and Evolution of Life Lecture - Josh...

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Josh Bovard Biology 111 – Thursday, September 4 th , 2008 Professor Graham Bell O RIGIN AND E VOLUTION OF L IFE Why study evolution? Provides the context for everything else in biology; without it we cannot understand many aspects of biology Antibiotic Resistance : The resistance commonly develops and emerges, however in our lifetime it evolves Provides a tough barrier in medicine because the pathogen is always evolving along with the antibiotic The body does not react until the bacteria because systemic New antimicrobial peptides antibiotics are newer, more effective ways of killing bacteria Simple strings of 20-25 peptides They target a general characteristic of bacterial cells that is very difficult to be change, hence making resistance unlikely to evolve Some chemists and biologists will argue the resistance cannot evolve because of the simple structure of the bacterial cell Other evolutionary biologists will argue that the bacteria will evolve due to the always occurring mutations in the DNA Evolutionary biologists think of bacteria as a population, whereas genetic biologists think of bacteria of a single cell However, if resistance were to evolve, then the therapy of antimicrobial peptides would be lost and the consequences might include the compromise of our innate immune system
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Sept 4-08 - Origin and Evolution of Life Lecture - Josh...

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