Transcription – Higher tier


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:

  1. The DNA in a gene unzips so that both strands are separate – one strand is used as a template
  2. Complementary bases attach to the strand being copied – C joins to G and so on
  3. Thymine (Base T) is not present and a different base, U, joins with A in the way that T would have done
  4. This forms a strand of messenger RNA (mRNA)

DNA helix unzipping and being copied

DNA helix unzipping and being copied

Messenger RNA is small enough to move out of the nucleus and so it travels to the ribosomes in the cytoplasm.

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