quiz5 key - AGRY 320 GENETICS Spring 2011 April 20, 2011...

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AGRY 320 GENETICS Spring 2011 April 20, 2011 QUIZ #5 NAME ______________________________________________ Carefully read the material and the instructions and answer the questions. Feel free to use the back of this page to perform work so that you can clearly place your answers in the spaces provided.
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Lac Operon 1. ( 2 points ) Name the enzyme the lacZ gene encodes. Beta-galactosidase 2. ( 2 points ) The protein encoded by the lacI gene may be called a transcription factor. True or False (circle the correct answer) 3. ( 6 points ) The lac operon provides an example of a genetic switch. For each of the following phenotypes, indicate whether the switch is broken or unbroken (circle the correct answer), and if the switch is broken, describe how it malfunctions? a) Lac - : broken or unbroken unable to turn on (beta-galactosidase) b) Lac C : broken or unbroken _ unable to turn off (beta galactosidase) __ c) Lac+: broken or unbroken _ able to turn on and off ______ 4. ( 10 points ) Write the phenotypes that correspond to the following genotypes:
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This note was uploaded on 02/26/2012 for the course AGRY 320 taught by Professor Stewert during the Spring '09 term at Purdue University-West Lafayette.

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quiz5 key - AGRY 320 GENETICS Spring 2011 April 20, 2011...

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