Which of the following best describes the role of lactose in the Lac Operon?
1. Lactose binds to the Lac operon promoter preventing RNA polymerase to......lac genes
2. Lactose represses the expression of the lac genes when too much lactose is available
3. Lactose binds to Lac I, the inhibitor of lac gene expression
4. Lactose is produced when the lac operon is activated
5. Lactose inhibits Beta galactosidase which breaks down Lactose
The strain of bacteria PenR is resistant to penicillin while the PenS strain is susceptible to penicillin. Both strains are pathogenic. State what would be the fate of mice treated as described below?
1. Pen R bacteria were heat denatured , mixed with Pen S, and injected into mice
2. Pen S bacteria were heat denatured , mixed with Pen R and injected into mice treated with ampicillin
3. Pen R bacteria were heat denatured and injected into mice treated with penicillin
4. Pen S bacteria were heat denatured and mixed with live Pen S bacteria and injected into mice treated with penicillin
5. Pen S bacteria were mixed with Pen R bacteria heat denatured and injected into mice
Options for each: mice will survive or mice will die