Is it important which DNA strand is copied after RNA polymerase opens it?

yes, it is important that which strand is copied after rna polymerase poens it as it further lesds to proper fumction and heriditerary trates.the dna strand copied after rna polymerase open it dpends on the activities taking place in the dna at the moment.eg-changing of nucleoside to nucliotide,etc.it also results in proper or improper synthesis of selective protiens.