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Lecture 10 - Biology 313 Lecture 10 QUIZ 3 Dr.Gwyn Beattie...

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Biology 313 Lecture 10 Sept 15, 2010
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QUIZ 3
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Wednesday 22 September  Bessey Room 210 @ 7 pm FREE PIZZA & POP! (for dues-paying members) Dr.Gwyn Beattie, Plant Pathology Department “Survival strategies and community functions of leaf-associated bacteria”
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Regulation of protein amounts is crucial to proper cell function Excess amounts of a given protein can be toxic to the cell, e.g., at high concentrations, it could begin to bind less favorable binding sites on the “wrong” molecules, upsetting the latter’s function. If the protein is an enzyme, increased amounts could lead to increased production of a product ; this could upset the functioning of metabolic paths in the cell, whose substrate and product concentrations are tightly regulated.
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Usually, excess proteins are degraded, but too much protein can “clog” up the protein degradation system with partially denatured proteins that can form precipitates (hydrophobic interactions) Excess amounts of a given protein are also energetically wasteful to the cell (it takes energy to make it and also energy to degrade it)
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