Transcription is the synthesis of mRNA from a DNA template. It is like DNA replication in that a DNA strand is used to synthesize a strand of mRNA. RNA polymerase recognizes a specific base sequence in the DNA called a promoter and binds to it. RNA polymerase unwinds the DNA. RNA polymerase assembles bases that are similar to the DNA strand being copied. The mRNA produced is called the mRNA transcript. The remaining portions of DNA that are translated into protein are called exons. After the intron-derived regions are removed from mRNA, the remaining fragments are spliced to form a mature mRNA transcipt.
No comments:
Post a Comment