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  • DNA
    • Genes
      • Human DNA contains approx 25,000 genes
      • A single gene codes for a single polypeptide chain
      • Found on chromosome
    • 'DNA codes for all molecules'
      • DNA codes for formation of proteins such as enzymes that synthesis production of other non-protein molecules
    • The Genetic Code
      • 64 possible combinations for the 4 bases to be read (in triplets)
      • Genetic code is widespread but not universal, there are some variations
    • DNA location & transcription
      • Proteins are formed at the ribosomes
      • DNA coding for the formation of protein is too large to leave the nucleus, so the genes required are copied forming mRNA


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