Biol200 Exam2_2012_key

Biol200 Exam2_2012_key - Biology 200, Winter 2012 Exam 2...

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Biology 200, Winter 2012 Name _________________________________ Exam 2 Version D Section ____________ TA ________________ Page 1 DO NOT OPEN THIS EXAM UNTIL INSTRUCTED TO DO SO: INSTRUCTIONS : When you begin, please make sure to put your name on all pages (1-5). When you are finished: Turn in your exam to your TA. Please leave the room as quietly and gracefully as possible. This exam is worth 110 points. Pages 2-5 will be graded. The suggested length for your answer to short answer questions is 2 sentences or less unless otherwise indicated. You do not need to use the entire limit, and some questions may be answered in a single word. Extra information, if incorrect, will lower your score.
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Biology 200, Winter 2012 Name _________________________________ Exam 2 Version D Section ____________ TA ________________ Page 2 Please sign the following agreement. By signing this, you agree to not accept or provide assistance to anyone else during this exam. Honor Code Agreement - Signature: _____________________________ Date: ______ *************************************************************************** 1 ( 12 pts ) How will mutations that inactivate the following regulatory or gene sequences affect lactose metabolism? When answering this question, do not take into account how sugar conditions affect operon activity. (Write “ I ” if the mutation would Increase lactose utilization or D ” for if the mutation would Decrease lactose utilization) Lac I promoter _ _I_ _ Lac I gene _ _I__ CAP site _ _D__ Lac promoter _ _D__ Lac Z gene _ _D__ Lac Y gene _ _D__ 2 ( 8 pts ) A new bacterial organism has been found in the mud of Lake Washington. It has proven very difficult to grow in the laboratory as it was found to be very fragile. The cell walls of this new organism were found to have both alpha and beta glycosidic linkages. How can you explain the fragility of the organism? (4) Normally, cell walls are composed of sugars held together by β -glycosidic linkages. (4) The inclusion of
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Biol200 Exam2_2012_key - Biology 200, Winter 2012 Exam 2...

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