1. Under which conditions would the lac operon produce the greatest amount of ?-
ID: 259418 • Letter: 1
Question
1. Under which conditions would the lac operon produce the greatest amount of ?-galactosidase? The least? Explain your reasoning.
Lactose present Glucose Present
Condition 1 Yes No
Condition 2 No Yes
Condition 3 Yes Yes
Condition 4 No No
Explanation / Answer
Please find the answers below:
Lac operon is an inducible operon which encodes for gene beta galactosidase for degradation of lactose as a preferred substrate rather than glucose. Thus, presence of glucose prevents expression whereas presence of lactose up-regulates expression. Thus, the answers can be found as below:
Answer 1: Strong expression (since the inducer or lactose is present and repressor or glucose is absent, strong expression will take place)
Answer 2: No expression (lac operon does not operate in presence of glucose and absence of lactose as glucose will not induce transcription in genes)
Answer 3: Mild expression (although lactose is present, the presence of glucose will partially mask the operator and thus presvent complete expression of the cistron)
Answer 4: No expression (Since lactose is altogether absent, no expression of beta galactosidase will be required by the cells)
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.