Answer Happy

lac operon questions 1. A bacterium has one wild-type copy of the lac operon and an l- mutation. Assuming glucose levels are low, there would be transcription of the lac operon in a. the presence of lactose b. the absence of lactose c. both d. neither 2. What if the bacterium is identical to the one in #1 above except it has an I mutation instead of the I- mutation? Assuming glucose levels are low, there would be transcription of the lac operon in a. the presence of lactose b. the absence of lactose c. both d. neither 3. What if a bacterium has a wild-type I gene, but in its one copy of the lac operon, the operator is defective (an O mutation)? Assuming glucose levels are low, there would be transcription of the lac operon in a. the presence of lactose b. the absence of lactose c. both d. neither 4. Using the merozygote (partial diploid) with two copies of the lac operon as shown below, and assuming glucose levels are low, there would be transcription in the cell in a. the presence of lactose b. the absence of lactose c. both d. neither Genotype of merozygote: Is P+ OZ FP+O+Z¹ 5. In the same merozygote above, there would be functional beta-galactosidase protein present in the cell in a. the presence of lactose b. the absence of lactose c. both d. neither 6. Under which of the following conditions is the lac operon most fully transcribed? a. Low lactose, low glucose b. Low lactose, high glucose c. High lactose, low glucose d. High lactose, high glucose