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Apr '09
MCAT Question of the Day | MCAT Course

  • Q:

    The Lac operon contains three genes; Lac A, Lac Z, and Lac Y. A promoter lies upstream of the three genes. When IPTG, an inducer of the lac operon, indirectly exposes the promoter, which of the operon genes will be transcribed?



    none; only genes immediately adjacent to the promoter will be transcribed


    the first gene in the operon; all genes are controlled by their own individual promoters


    none; promoters do not control the transcription of genes on operons, only standalone genes


    all; all genes within a single operon are transcribed as a unit, as initiated by a single promoter

    Tags: Genetic Code, Transcription, Translation | Prokaryotes | Suggest a tag


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