For the process of transcription (synthesis of RNA from a DNA template), the key requirements are:

  • A DNA template strand that carries the gene to be transcribed.
  • The enzyme RNA polymerase , which catalyzes the formation of the RNA strand using the DNA template.
  • Ribonucleotide triphosphates (NTPs: ATP, GTP, CTP, UTP) as substrates to build the RNA chain and provide energy.
  • A promoter region on the DNA, where RNA polymerase and associated factors bind to initiate transcription.
  • (In eukaryotes) General transcription factors that help RNA polymerase recognize the promoter and form the pre‑initiation complex.

Elements like ribosomes, tRNA, and amino acids are not required for transcription; they are needed for translation , which is the next step in protein synthesis.

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