BIOL 1000 Chapter Notes - Chapter 14: Proteasome, Methylation, Chromatin
Document Summary
14. 1 regulation of gene expression in prokaryotic cells. Prokaryotic organisms tend to be single celled and relatively simple, with generation times measured in minutes. Prokaryotic cells typically undergo rapid and reversible alterations in biochemical pathways that allow them to adapt quickly to changed in their environment. 14. 1a the operon is a unit of transcription. Operon a cluster of prokaryotic genes and the dna sequences involved in their regulation. Promoter a region where the rna polymerase begins transcription. Operator another regulatory dna sequence in the operon; a short segment that is a binding sequence for a regulatory protein. A gene that is separate from the operon encodes the regulatory protein. Some operons are controlled by a regulatory protein termed a repressor. When bound to dna, reduces the likelihood that genes will be transcribed. Other operon are controlled by activators when bound to dna, Increases the likelihood that genes will be transcribed.