Match each component of the lac operon in E. coli with its best description. lac I gene CAP + cAMP repressor protein lac permease (galactoside permease) beta-galactosidase promoter operon transporter that brings lactose codes for repressor protein set of genes that are transcribed sequence of DNA upstream from binds at operator site to block bind at activator site to activate enzyme that cleaves lactose
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lac gene: This is the set of genes that are transcribed together, so it matches with the description "set of genes that are transcribed together". Show more…
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The E. coli lac operon is an example of an inducible operon, because transcription of the operon is induced by lactose. The E. coli trp operon is an example of a repressible operon, because transcription of the operon is repressed by tryptophan. Review the E. coli trp operon in your textbook and answer the following questions: a. (1 point) What type of molecule is tryptophan AND what metabolic pathway are the enzymes encoded by the trp operon involved in? b. (3 points) Hand-draw the E. coli trp operon in the situation where plenty of tryptophan is available. Label the components of the trp operon and the DNA-binding proteins involved. Indicate whether or not the trp operon is transcribed.
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