quiz7 - Biol241, Quiz 7 3/5/2010 [Question 1-5 is a set]...

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Biol241, Quiz 7 3/5/2010 [Question 1-5 is a set] The mmm operon, which has sequences A, B, C, and D, encodes enzymes 1 and 2. Mutations in sequences A, B, C, and D have the following effects, where a plus sign (+) indicates that the enzyme is synthesized and a minus sign (-) indicates that the enzyme is not synthesized. Mmm absent Mmm present Mutation Enzyme Enzyme Enzyme Enzyme In sequence 1 2 1 2 No mutation + + - - A - + - - B + + + + C + - - - D - - - - 1) The mmm operon is a) Inducible. b) Repressible. 2) The regulatory gene is a) A b) B c) C d) D 3) The promoter is a) A b) B c) C d) D 4) The structural gene for enzyme 1 is a) A b) B c) C d) D 5) The regulatory gene is a) A repressor b) An activator
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Biol241, Quiz 7 3/5/2010 6) The activity of the enzyme β –galactosidase produced by wild-type cells grown in media supplemented with different carbon sources is measured. In relative units, the following levels of activity are found: Glucose Lactose Lactose + Glucose 0 100 1 Predict the relative levels of
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quiz7 - Biol241, Quiz 7 3/5/2010 [Question 1-5 is a set]...

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