Bacterial and eukaryotic cells primarily control gene expression at the level of transcription. if instead cells exerted control of gene expression primarily at the post-translational level, what would be different?

At post translational level of gene expression prokaryotic protein is less modified than that of eukayotes .

Explanation:

Post translational modification is less affecttive in case of prokaryotes than that of Eukaryotic  protein .

                        There are more covalent modification of proteins in eukaytotes than that of eukaryotes .The covalent modification that occur in eukaryotic protein such as  Acetylation,phosphorylation,dephosphorylation,hydroxylation,ubiquitination.

   On the other hand protein phosphorylation is the most evident post translational modification in Prokaryotes .

  Very low  degree of glycosylation occur in prokaryotic protein in comparison to that of Eukaryotic protein.

      Palmitoylation of cystein residue of protein occur in eukaryotes but do not occur in case of prokaryotic protein.

i think that c)gold was found there

but i am not sure

sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.