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The lac repressor protein can bind to either the operator or allolactose.?

• The lac repressor protein can bind to either the operator or allolactose. The trp (tryptophan) operon also has a repressor protein, trpR. The trpR protein can simultaneously bind to both excess trp in the cell and the trp operator at which point it blocks transcription of the trp operon. If there is no excess trp in the cell, then the trpR protein binds nothing and transcription of the trp operon can occur. How do these different patterns of molecules binding to repressors make sense? a. The lac operon should only be transcribed when lactose is available and needs to be broken down. b. Having the repressor bind to allolactose, allows transcription specifically when lactose is present. c. The cell does not need to make more trp when plenty is available and there is enough to bind to the trpR. d. Having the trpR only block transcription when excess trp is present is what is needed for a pathway synthesizing an amino acid. e. All of the above are true. This is from a practice problem set I have for an upcoming test.

• Answer:

  E. All are true.