Question

what is the sequence of events that take place in the trp operon when tryptophan is present? begin with the first event at the top of the list.

Answer 1

When tryptophan is present in the cell, two tryptophan molecules bind to the trp repressor, which changes shape to bind to the trp operator. Binding of the tryptophan–repressor complex at the operator physically prevents the RNA polymerase from binding, and transcribing the downstream genes.