What is transcription

transcription

1. What is transcription?

2. Transcription is what occurs once DNA replication has taken place. DNA is transcribed to make RNA. Transcription Requirements: DNA template Raw materials (RNTPs) Enzymes

3. Because not all genes on DNA are needed all the time transcription is VERY specific.

4. This is RNA at primary level. It is not very stable.

5. mRNA is what is used to transcribe DNA, which in turn will make proteins. In Eukaryotes pre-mRNA exists and once it leaves the nucleus is then mature mRNA. Mature mRNA is when the introns are removed and a 5’ cap and poly A tail are added. In Prokaryotes pre- mRNA does not exist, instead transcription and translation take place simultaneously.

6. How does RNA know where to code? In Eukaryotes the DNA has a promoter region, this must be bonded to in order for transcription to start, however, the promoter is not transcribed. Then you have a transcription start site and from then on is the RNA-coding region. Once everything necessary to be transcribed is done the terminator region will appear. The terminator is transcribed.