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Unformatted text preview: c. selection d. both a and c e. none of the above 11. Which of the following situations results in maximum expression of the three structural genes of the lac operon? a. only glucose present b. only lactose present c. both glucose and lactose present d. neither glucose or lactose present e. when glucose is being catabolized 12. A mutation in the I gene of the lac operon results in production of a protein that can bind to the O region but not to lactose. Which of the following would describe the transcription of the structural genes (Z, Y & A) of the lac operon ? a. the genes would never be transcribed b. the genes would always be transcribed c. the genes would only be transcribed if lactose was present d. the genes would only be transcribed if glucose was present e. none of the above...
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- Fall '10