Popquiz_answerkey - enable yeast utilize galactose The key...

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Name: _______________________ Student ID: ____________________ 1. E. coli bacteria are placed into a medium containing glucose and lactose. Which of the genes below do you expect to be turned on? a) β -galactosidase b) Lac P c) Permease d) None of the above 2. The lac repressor protein controls expression of the lac operon via ________________ a. binding to the lac structural genes to repress expression b. binding of the lac Z and lac Y genes only c. binding to the lac promoter site to repress expression d. binding to the lac operator site to repress expression e. all of the above 3. In the absence of glucose and in the presence of galactose, several genes are activated to
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Unformatted text preview: enable yeast utilize galactose. The key regulator(s) of the yeast GAL system is/are the _______ protein(s). a. Gal80 b. Gal4 c. Gal3 d. All of the above e. None of the above 4. Use your knowledge of the lactose system to complete the following table. Insert a “+” where an enzyme is produced and a “-“ where no enzyme has been produced. B-galactosidase (LacZ) Permease (LacY) No lactose Lactose No lactose Lactose a. I-P + O C Z + Y-/I + P + O + Z-Y + + +-+ b. I + P-O C Z + Y-/I-P + O + Z-Y +---+...
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