Genes and the genetic code

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What is a gene?:

  • A section of DNA that contains the coded information for making polypeptides and functional RNA
  • Located on a locus of a DNA molecule
  • Codes for - the amino sequence of a polypeptide or a functional RNA including ribosomal RNA and transfer RNAs

The genetic code:

Must be a minimum of 3 that coded for each amino acid because -

  • Only 20 different amino acids regularly occur in proteins
  • Each amino acid must have its own code of bases on the DNA
  • Only four different bases are present in DNA
  • If each


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