6. A bacterium does not want to waste energy synthesizing theamino acid arginine if arginine is present in its diet. Therefore,when arginine is present, it activates a repressor protein toprevent transcription of genes that code for enzyme to makearginine. This is an example of what type of regulation? Pleasedescribe the mechanism of this regulation.

7. Prokaryotic genetic information transferring processusuallyacts as target of antibiotics. We observed a new compound withantibiotic action, and we have already proved this compound do notaffect the bacterial replication process. Based on your knowledgeabout gene information transmission (DNA replication, transcriptionand translation), please assume the possible mechanism(s). Pleaseuse your knowledge to make an experiment to prove yourassuming?

8. The initiation of transcription in eukaryotes is a keypointof gene expression regulation. The interaction betweenbiological macromolecules (protein-protein, protein-nucleotide) isvery important in the expression regulation of eukaryotic genes.Can you give two examples of regulatory mechanisms related totranscription initiation? Describe the structural features of themolecules.

Choose one or two of this questions to which you are themost certain. thanks!!!