Which statement best describes the mechanism(s) of posttranslational regulation of gene expression?

Which statement best describes the mechanism(s) of posttranslational regulation of gene expression?

Select one:

a. Allosteric regulation following transcription of mRNA occurs in many biosynthetic pathways.

b. Protein synthesis is often repressed by feedback or noncompetitive inhibition. 

c. Covalent modification of newly synthesized proteins generally has no marked effect on protein function.

d. Once a protein is synthesized, there is little to no postranslational modification.