d. Analyze the data on the table below. You inoculate three flasks of liquid media with E. coli. Indicate if the lac operon would be turned on or turned off in each flask and explain why you think the lac operon would be turned on or turned off in each flask. Flask sugar present in the media #1 glucose only #2 lactose only #3 both glucose and lactose
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coli that regulates the expression of genes involved in lactose metabolism. It's only turned on when lactose is present and glucose is absent. Show more…
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You are growing E. coli in the laboratory. From your understanding of the lac operon, answer the following questions. MAKE SURE TO EXPLAIN YOUR ANSWERS. A) How is the expression of lac genes affected if E. coli is grown in a medium containing lactose but not glucose? B) How is the expression of lac genes affected if E. coli is grown in a medium containing both lactose and glucose? C) What are the consequences of growing E. coli in media containing neither glucose nor lactose? D) What are the consequences of growing E. coli in media containing glucose but no lactose?
Adi S.
Question 19 (6 points) Review the following scenarios for gene expression of the lac operon, fill in the blank with either, the word ON ( to indicate the the lac operon genes would be expressed and lac operon enzymes would be produced), or OFF ( indicating the lac operon genes would not be expressed, i.e. the proteins would not be produced). 1. scenario 1: In a cell in which glucose is present but lactose is not, the lac operon genes would be turned __________ 2. scenario 2: In a cell that has lactose present but no glucose the lac operon genes are turned__________. 3. scenario 3: In a cell that contains both glucose and lactose the lac operon genes are turned __________. Blank # 1 Blank # 2 Blank # 3
The lac operon is a classic example of a controlled operon. For the scenarios listed below, say if the lac operon would be turned fully on or remain off (in other words, high expression or little to no expression): A) No lactose present, no glucose present: Answer ON OR OFF? B) Lactose present, no glucose present: Answer ON OR OFF? C) No lactose present, glucose present: Answer ON OR OFF? D) Lactose present, glucose present: Answer ON OR OFF?
Sri K.
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