For questions 5- 8, identify the correct answer and explain why you chose that a
ID: 209976 • Letter: F
Question
For questions 5- 8, identify the correct answer and explain why you chose that answer (include in your answer the reason each of the other answers are incorrect). 5. Under which of the following conditions would a lac operon produce the greatest amount of galactosidase?) (0.75 pts) a. Lactose present & glucose absent b. Lactose absent & glucose present c. Lactose present & glucose present d. Lactose absent & glucose absent A mutant E. coli strain, grown under conditions that normally induce the lac operon, produces high amounts of B- galactosidase. What is a possible genotype of the cells? (0.75 pts) 6. b. lacr lace laco lacz lac lack c. lact lacP laco lacz lacY lacA d. lach lacP laco lacz lacY lacA e. lact lacP laco lacz lac laca What would be the effect of a mutation that prevents the formation of the antiterminetor 2+3 loop in the tre operon? (0.75 pts) a. Transcription only when tryptophan is absent b. Transcription only when tryptophan is present c. Constitutive attenuation of transcription d. Constitutive transcription e. No effect, as 2+3 loop has no function 7. 8. A regulatory protein responsible for negative control In a repressible operon weillinitially be synthesized as an (0.75 pts) A. Active repressor B. Active activator C. Inactive repressor D. Inactive activatorExplanation / Answer
5. The following conditions would a lac operon produce the greatest amount of beta galactosidase
(c) lactose present and glucose present
Under the low levels of glucose and high levels of lactose lac operon produce the greatest amount of galactosidase.
6. A mutant E.coli strain, grown under conditions that normally induce the lac operon , produce high amount of beta galactosidase.The possible genotype of the cells are:
(b) lacl+lacP-lacO+lacY+lacA+
7. The effect of a mutation that prevents the formation of the antiterminator 2+3 loop in the trp operon.
(c) constitutive attenuation of transcription.
8. A regulatory protein responsible for negative control in a repressible operon will initially be synthesized as an inactive repressor.
(c) inactive repressor