mbb Topic 9: control of gene expression

what are housekeeping genes \ genes common to all cells such as ribosomal proteins, RNA polymeraes cytoskeleton proteins, proteins involved inbasic metabolic processes etc;

how can a cell control the proteins it contains \ 1. controlling when and how oftena gene is transcribed 2. controlling how a RNA transcript is spliced or otherwise processed 3. selecting which mRNAs areexported from the nucleus to the cytosol 4. regulating how quickly certain mRNA molecules are degraded 5. slecting which mRNA are translated into proteins by ribosomes 6. regulating how rapidkly specific proteins are destoryed after they have been made 7. regulating protein aftivity;

whats an operon \ genes that encode proteins that are all involved in the same process, common in bacteria;