Study notes for midterm

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Department
Molecular Genetics and Microbiology
Course
MGY377H1
Professor
William Navarre
Semester
Fall

Description
13Normal growth conditions based on human frame of reference Sea level Twenty to forty degrees CelsiusNeutral pHSalt concentration of 09 Ample nutrients Any ecological niche outside this range considered EXTREME o Such life organisms called extremophiles Environmental effects on bacterial growth Four key factors temperature pH water availability oxygen TemperatureCardinal temperatures for each organismo Minimal temp o Optimal temp o Maximum temp Below minimum temp membrane gelling transport processes so slow that growth cannot occur Above maximum temp protein denaturation collapse of cytoplasmic membrane thermal lysis Classes o Psychrophileoptimal growth is fifteen degrees or less Survive in small pockets of water in ice glaciers glacial lakes snowfields Adaptationsy More alpha helices less beta sheetsmore flexible l
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