Which of the following is not true of the lac operon?
A. Transcription produces a single polycistronic mRNA containing the lacZ, lacY, and lacA genes.
B. The lacI gene is controlled from the same promoter as the lacZ gene.
C. The Lac repressor protein is constitutively expressed.
D. The operator region regulates transcription through interaction with the Lac repressor protein.
B
Biology & Microbiology
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