Saturday, August 22, 2015

Transcription

Transcription is the process in which DNA is used to create a complementary DNA copy called mRNA. There are 3 steps.
  1. RNA polymerase binds to DNA. RNA polymerase is an enzyme that binds to DNA. There are certain START and STOP DNA sequences that tell RNA polymerase where to bind and transcribe.
  2. Elongation. Transcription factors unwind DNA and allow RNA polymerase access to only a part of the DNA double helix. Guanine pairs with cytosine, and adenine pairs with uracil.
  3. Termination. When RNA polymerase reaches the termination sequence, RNA polymerase releases mRNA.

No comments:

Post a Comment