The Trp Operon

Practice: The trp operon consists of ________ genes that encode tryptophan biosynthesis enzymes.

Practice: Under what conditions does the trp repressor block transcription of the trp operon?

Practice: If the trp regulatory gene mutates so that the repressor protein can no longer bind to tryptophan what will be the result?

Practice: In the absence of tryptophan, ______:

Practice: Based on the information you know about the trp operon, is the creation of tryptophan expensive to the cell?