This preview shows pages 1–3. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: trp repressor must first bind to a molecule of tryptophan before it can bind effectively to the trp operator. The trpR gene encodes the repressor. trpO is the operator. trpA encodes the enzyme tryptophan synthetase. A trpR-repressor cannot bind tryptophan. A trpO-operator cannot be bound by the repressor. And the enzyme encoded by trpA-mutant is completely inactive. Do you expect to find active tryptophan synthesetase in each of the following strains when the cells are grown in the presence of tryptophan and in its absence? (+) indicates wild type. R + O + A + R-O + A + / R + O + A-R + O- A + / R + O + A-R + O- A + / R + O- A-R-O + A + s fi n d tr y...
View Full Document
This note was uploaded on 03/28/2011 for the course LS 4 taught by Professor Ribaya during the Spring '08 term at UCLA.
- Spring '08