Which of the following statements about operons are true? (Check all that apply) Operons are common in eukaryotes, but rare in prokaryotes. An operon encodes multiple (different) proteins. An operon encodes multiple (different) RNAs. An operon contains multiple promoters. The RNA produced from an operón contains more than one Shine-Dalgarno sequence. Operons often contain genes that function in a similar process so they are all turned on or turned off together. In other words, a mechanism to "coordinate" gene expression. >

An activator (protein “V” – not encoded by this operon) binds to the activating region and RNA polymerase is bound to promoter. Describe what is occurring in terms of operon regulation/control.

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.

The organization and function of the lac operon in E. coli is shown in the following figures: XXI Transcription Repressor mRNA Translation RNA polymerase M M Flask ZYA XXXX Active M-repressor protein Repressor active, operon off. The repressor protein binds with the operator, preventing transcription from the operon. (a) An inducible operon Copyright © 2007 Pearson Education, Inc., publishing as Benjamin Cummings Allolactose (inducer) Carbon/Energy Source 0 Z MInactive repressor protein (a) An inducible operon Transcription Translation XXX Permease B-Galactosidase Transacetylase Operon mRNA 3 Repressor inactive, operon on. When the inducer allolactose binds to the repressor protein, the inactivated repressor can no longer block transcription. The structural genes are transcribed, ultimately resulting in the production of the enzymes needed for lactose catabolism. Copyright © 2007 Pearson Education, Inc., publishing as Benjamin Cummings Suppose you inoculate three flasks of minimal…