transcription

• produces an RNA copy of one gene

  Transcription
• RNA nucleotide bases bind with exposed complementary bases on the template strand, which is the strand in DNA molecule that is actually copied to RNA

  transcription
• process of transcription

  initiation, elongation, termination
• unzips the DNA double helix, exposing the template strand

  enzymees
• this enzyme builds an RNA chain and binds to the promoter

  DNA polymerase
• a DNA sequence that signals the gene’s start

  promoter
• moves along the DNA template in a 3’ to 5’ direction

  RNA polymerase
• this sequence signals the end of the gene; th enzyme separates from the DNA template and releases newly synthesized RNA

  terminator
• production of either a function RNA molecule or a protein

  gene expression
• what alternating sequences does mRNA consist of

  introns and exons
• means within gene


  intron
• portions of mRNA molecule that are expressed or that exit the nucleus and are spliced together to form the mature mRNA that leaves the nucleus to be translated

  exons
• RNA polymerase recognizes the recognition sites causing it to bind to the promoter. The RNA polymerase then separates the DNA into single strands so the template can be read in the 3' to 5' direction.

  initiation
• Pre-mRNA nucleotides are quickly paired with their complementary bases which correspond with the template DNA strand.

  elongation
• When the RNA Polymerase reaches this stage, it signals the RNA Polymerase to stop and release from the DNA. Once separated the two DNA strands come back together.

  termination