A. This constitutes part of the gene that encodes information for RNA polymerase to bind B. An activator and a repressor protein are examples of C. Regulation of leads to changes in cell functions. D. Inhibition of a gene's expression, called is due to the activity of a which can act to block RNA polymerase from physically moving down the DNA strand. E. Activation of a gene's expression, called is due to the activity of a to attract RNA polymerase to the for the gene. F. Genes with will often need the help of an activator to induce expression. G. Genes with will not need the help of an activator to induce expression..