Molecular Genetics of Prokaryotes and Viruses

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Chapter 16

• Molecular Genetics of Prokaryotes and Viruses

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Enzymes regulating the transcription of a gene
can be

• Inducible gene
• Inducible genes are those in which the presence
  of a substance (an inducer) in the environment
  turns on the expression of one or more genes
  (structural genes) involved in the metabolism of
  that substance.
• Lac genes
• Effect of low glucose on cAMP-CAP
• Repressible
• Repressible genes are those in which the presence
  of a substance (a co-repressor) in the
  environment turns off the expression of one or
  more genes (structural genes) involved in the
  metabolism of that substance
• Trp genes

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Plasmids and Conjugation

• Plasmids- small circular pieces of DNA
• Code for extra stuff
• Episome
• Plasmid that has been incorporated into the
  bacterial chromosomes

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