In the presence of arabinose sugar and absence of glucose, which of the following conditions may be observed at the arabinose operon? Mark all the answers that apply.   AraC protein binds to the ara I and ara O2 sites to form a repression loop. Arabinose binds to the CAP protein to cause it to stimulate transcription.  The CAP-cAMP complex binds to AraC protein to form a repression loop. The CAP-cAMP complex binds to the CAP-binding site to help stimulate transcription. AraC protein binds to the araI site to stimulate transcription.

Given the Table below concerning the lac operon, match the letter with what would be occurring for each scenario. Repressor is bound to the operator, cAMP complex is bound and transcription is prevented.   Allolactose is bound to the repressor, cAMP complex is bound, and transcription is prevalent.                                    Allolactose is bound to the repressor, cAMP complex is not assembled, and transcription is slow                        Repressor is bound to the operator, cAMP complex is not assembled, and transcription is prevented.

Why is it beneficial for the bacterium to regulate the lac operon with both a repressor protein and an activator protein?

Select all of the cis-acting regulatory elements of the lac operon. Operator CAP+cAMP CAP+cAMP binding site LacZ

The lac operon contains three genes: lacZ, lacY, and lacA for ß-galactosidase, galactoside permease, and thiogalactoside transacetylase, respectively. The operon also contains a promoter site and an operator site. The regulatory gene includes the I gene for the Lac repressor protein and a promoter for that gene. regulatory gene DNA P₁ lacl gene The lac operon undergoes negative regulation. In the normal condition, the Lac repressor protein is active. Allolactose, an isomer of lactose, is the signal molecule that binds to the Lac repressor. P O Increase in gene products The I gene is disabled. Lactose is present in the cell. The Lac repressor dissociates from DNA. lac operon lacZ gene Determine which events will increase the concentration of lac gene products and which will decrease the concentration of lac gene products. Allolactose is not present in the cell. lacy gene lacA gene Decrease in gene products Allolactose binds to the Lac repressor protein. The Lac repressor remains bound…

A mutation at the operator prevents the regulator protein from binding.What effect will this mutation have in the following types of operons? Q. Regulator protein is a repressor of a repressible operon.