The polycistronic Histidine Operon in E. coli encodes all of the proteins necessary for the biosynthesis of the amino acid histidine. His X is a separate operon that encodes the His X protein. His X regulates the His Operon by positive regulation. The fact that His X engages in positive regulation means that His X promotes RNA pol binding to the His Operon promoter His X might promote or inhibit RNA pol binding to the His Operon promoter depending on how histidine affects His X DNA binding ability E. coli transcribes the His Operon only when histidine levels are high E. coli transcribes the His Operon only when histidine levels are low His X blocks RNA pol binding to the His Operon promoter

QUESTION 36 Mr. Jones has an upper respiratory tract infection. This means he has an infection associated with the bronchioles O pleura O lungs O pharynx

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Question 8 Name the structures 9. 7 8 10 7 9. 10

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