Bill the Bacteria, gene expression

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  • BUT WHAT HAPPENED?
  • Sorry for the unexpected session Ms. Makala... life's just been hard recently...
  • It all started when Mommy took away my lactose...
  • START FLASHBACK
  • Ladies and Gentlemen, Welcome to my movie, "Bacteria"
  • TEST 1: REPRESSION
  • We did 3 tests on my special bacteria, Bill. Hope you enjoy!
  • I'M STARVING, WHY DID MOM TAKE AWAY MY LACTOSE
  • OPERATOR, my name is repressor and you're under arrest!
  • (Narrator). Bill's lactose was taken away as lactose is the inducer that starts gene expression. Without it, repression occurs and the repressor protein binds to the operator. 
  • THIS MEANS THAT RNA POLYMERASE CANNOT BIND TO THE OPERATOR AS IT IS LOCKED IN THE CELL WITH THE REPRESSOR PROTEIN! WITHOUT RNA POLYMERASE, GENE TRANSCRIPTION CANNOT START. 
  • TEST 2: ACTIVATION
  • Mom gave me back my lactose!
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