Final answer:
RNA polymerase (RNA pol) is responsible for transcription and does not perform nucleolytic proofreading; that function is carried out by DNA polymerase (DNA pol) during DNA replication.
Step-by-step explanation:
RNA polymerase (RNA pol) does not have a proofreading function during nucleolytic proofreading; this is a function of DNA polymerase (DNA pol) during DNA replication. The DNA polymerase reads the newly added base before adding the next one, checking for correct base pairing. If an incorrect base has been added, the DNA polymerase makes a cut and removes the wrong nucleotide, replacing it with the correct one.
RNA pol is responsible for synthesizing RNA from a DNA template in a process known as transcription. Unlike RNA pol, DNA pol reads the newly added base before adding the next one during DNA replication to ensure accuracy. If a mismatch is detected, DNA pol uses its 3' exonuclease activity to remove the incorrect nucleotide and replace it with the correct one.