1. Initiation:
* RNA polymerase, the enzyme responsible for transcription, binds to a specific DNA sequence called the promoter located at the beginning of a gene.
* The DNA molecule unwinds, separating the two strands to expose the template strand.
2. Elongation:
* RNA polymerase moves along the template strand, reading the DNA sequence.
* As it reads, it adds complementary RNA nucleotides to the growing RNA strand.
* RNA uses uracil (U) instead of thymine (T) to pair with adenine (A) in the DNA sequence.
3. Termination:
* RNA polymerase reaches a specific DNA sequence called the terminator.
* The enzyme detaches from the DNA, releasing the newly synthesized RNA molecule.
The newly synthesized RNA molecule is called messenger RNA (mRNA).
Here's a simplified analogy:
Imagine you have a recipe written in a cookbook (DNA). You want to copy the recipe so you can make the dish (protein). You use a special machine (RNA polymerase) to copy the recipe onto a separate piece of paper (mRNA). This new copy is then used to actually make the dish.
Key Points:
* Transcription is the first step in gene expression, the process of turning genetic information into a functional product.
* Transcription occurs in the nucleus of eukaryotic cells.
* The resulting mRNA molecule will then be transported out of the nucleus to the cytoplasm for translation into a protein.
Let me know if you have any more questions!
