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The lac Operon in E. coli
lac operon
2
Genes for enzymes
Enzyme Enzyme Enzyme
Enzym
3
How is structure 2 involved in regulating the transcription of the lac operon?
A. Structure 2 is the operator, which codes for the enzymes that
break down lactose.
B. Structure 2 is the repressor, which prevents the operon from being
transcribed
C. Structure 2 is the enhancer, which regulates the rate of



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