Why are the genes involved in lactose metabolism considered to be an operon?a. They occupy adjacent locations on the E. coli chromosome.b. They have a similar function.c. They are all required for normal cell function.d. They are all controlled by the same promoter.

You have inserted the gene for human growth factor into the E. coli lactose operon, replacing the structural genes with the gene for human growth factor. What substance must you add to your culture of bacteria to cause them to produce human growth factor for you?

Why are the genes involved in lactose metabolism considered to be an operon?a. They occupy adjacent locations on the E. coli chromosome.b. They have a similar function.c. They are all required for normal cell function.d. They are all controlled by the same promoter.

Evaluate these statements about regulation of the lac operon. Select True or False for each statement.T/FThe lac operon is transcribed at the highest rate when extracellular glucose and lactose are abundant.T/FThe repressor protein is bound to DNA of the operator when lactose is present.T/FA mutation in the operator is likely to prevent transcription of the lac operon under any condition.T/FA mutation that alters the catabolite activator protein is predicted to alter the regulation of many different operons.

Evaluate these statements about regulation of the lac operon. Select True or False for each statement.T/FThe lac operon is transcribed at the highest rate when extracellular glucose and lactose are abundant.T/FThe repressor protein is bound to DNA of the operator when lactose is present.T/FA mutation in the operator is likely to prevent transcription of the lac operon under any condition.T/FA mutation that alters the catabolite activator protein is predicted to alter the regulation of many different operons.

Predict what would happen to regulation of the lac operon if the lacI gene were moved 50,000 nucleotides upstream of its normal location.