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Transcription - Coggle Diagram
Transcription
Definition
- process in which DNA serves as a template
- for the formation of a mRNA molecule
1. DNA helicase
- unzips two relevant strands of DNA
- by breaking hydrogen bonds between bases
- requires ATP
forms two strands
- antisense/non-coding stand
= acts as template strand
- sense/coding strand
= not the template strand
2. Ribonucleotides
- from nucleoplasm
- complementary base pair
- with exposed bases on template DNA strand
- base pairing with H bonds
3. RNA polymerase
- moves along template strand
- catalyses condensation reactions
- between new ribonucleotides
- to form strand of mRNA
3 steps
- initiation
- elongation
- termination
4. Terminator
sequence
- when RNA polymerase reaches
terminator sequence
- mRNA released
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