A)RNA polymerase can start making a new RNA molecule without a primer; DNA polymerase cannot. B)RNA polymerase does not proofread its work; DNA polymerase does. C)RNA polymerase catalyzes the linkage of ribonucleotides while DNA polymerase catalyzes the linkage of deoxyribonucleotides. D)RNA polymerase adds bases in a 3′-to-5′ direction; DNA polymerase adds bases in a 5′-to-3′ direction.