Transcription – Higher tier
Transcription is the first part of the process of making a protein. It takes place inside the cell nucleus. Transcription involves copying the DNA and the stages are:
- The DNA in a gene unzips so that both strands are separate – one strand is used as a template
- Complementary bases attach to the strand being copied – C joins to G and so on
- Thymine (Base T) is not present and a different base, U, joins with A in the way that T would have done
- This forms a strand of messenger RNA (mRNA)
Messenger RNA is small enough to move out of the nucleus and so it travels to the ribosomes in the cytoplasm.