MCAT Question of the Day
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    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?
    		 

    A

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

    B

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

    C

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

    D

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



    Genetic Code, Transcription, Translation | Prokaryotes |
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