Dna transcription coloring pages

Only one of the two DNA strands serve as a template for transcription. The antisense strand of DNA is read by RNA polymerase from the 3′ end to the 5′ end during transcription (3′ → 5′). The complementary RNA is created in the opposite direction, in the 5′ → 3′ direction, matching the sequence of the sense strand with the exception of switching uracil for thymine. This directionality is because RNA polymerase can only add nucleotides to the 3′ end of the growing mRNA chain. This use of only the 3′ → 5′ DNA strand eliminates the need for the Okazaki fragments that are seen in DNA replication. This also removes the need for an RNA primer to initiate RNA synthesis, as is the case in DNA replication.