2011 Quizzes 7Nov11

2011 Quizzes 7Nov11 - Quiz 1(Lecture 6 1 The Crabtree...

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Quiz 1 (Lecture 6, 9/13/11) 1 . The Crabtree effect refers to: A. Excessive accumulation of NADH in the cell B. Production of harmful metabolic byproducts such as ethanol and lactic acid. C. A metabolic effect that results when cells are overfed. D. All of the above . 2. The yield coefficient is: A. Cell weight divided by glucose consumed. B. Product formed divided by glucose consumed. C. Cell weight divided by oxygen consumed. D. Any of the above can be a yield coefficient. 3 . Quorum sensing refers to the phenomenon where: A. Bacteria sense the concentration of a signaling molecule that accumulates as a function of cell density. B. The cell mass decreases as a function crowding in concentrated cell suspensions. C. The synthesis of new proteins during stationary phase D. The ability of bacteria to detect whether they are surrounded by eukaryotic cells. 4. Draw a typical microbial growth curve and in three words or less describe the growth rate, μ, in each phase.
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Quiz 1, answer for 4. μ =~ μ max , the maximum growth possible μ < μ max , cells adapting μ is negative μ < μ max , due to nutrient limitation or inhibitory products
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Quiz 2 : Lecture 12, 10/13/11 1. Which of the processes below CANNOT be used to facilitate the transfer DNA into cells: Zapping the cells for a few seconds with several hundred Volts. a)
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2011 Quizzes 7Nov11 - Quiz 1(Lecture 6 1 The Crabtree...

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