The key to the template replication is the specific pairing of the purine and pyrimidine bases via hydrogen bond formation. Please review this specific pairing and note the exact method of hydrogen bond formation by each pair of bases. The Flow of Biological Information. Transcription is the process by which the genetic information in DNA is copied to produce several types of RNA molecules. The enzyme for RNA synthesis is RNA polymerase and this enzyme unites the individual nucleotides into the RNA product.
Transcription occurs in three stages, initiation, elongation, and termination.
Eukaryotic genes contain introns, which are sequences that do not code for an amino acids, and are removed from the transcript by a process of splicing. The final mRNA molecule contains only the protein coding sequences or exons. Genes are also divided into structural and regulatory types. Structural genes encode proteins, whereas regulatory ones carry out various regulatory functions. The Genetic Code.