7.2  Transcription and Gene Expression

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Essential Idea:

Information stored as a code in DNA  

is copied onto mRNA


  • Transcription occurs in a 5’ to 3’ direction
  • Nucleosomes help to regulate transcription in eukaryotes
  • Eukaryotic cells modify mRNA after transcription
  • Splicing of mRNA increases the number of different proteins an organism can produce
  • Gene expression is regulated by proteins that bind to specific base sequences in DNA
  • The environment of a cell and of an organism has an impact on gene expression


  • The promoter as an example of non-coding DNA with a function


  • Analysis of changes in the DNA methylation patterns