TRANSCRIPTION

• WHAT HAPPENS IN TRANSCRIPTION?

  complementary mRNA copy of gene on DNA is created in the nucleus
• HOW DOES THE STRUCTURE OF mRNA ASSIST ITS FUNCTION?

  shorter, so able to carry genetic code to the ribosomes in the cytoplasm
• PROCESS OF TRANSCRIPTION?

  1. DNA helix unwinds to expose bases to act as a template
  2. Only one chain of DNA acts as a template
  3. DNA helicase catalyses unwinding and unzipping
  4. DNA helicase breaks hydrogen bonds between bases
  5. Free RNA nucleotides align opposite exposed complementary bases
  6. RNA polymerase joins RNA nucleotides
  7. Forms a new RNA polymer chain (one entire gene copied)
  8. mRNA leaves nucleus through nuclear envelope pores