GCU BIO 181 FINAL EXAM (EXAM 4) questions n answers

GCU BIO 181 FINAL EXAM (EXAM 4)The tryptophan operon is a repressible operon that is: - correct answer Turned off whenever tryptophan is added to the growth medium. The lactose operon is likely to be transcribed when: - correct answer The cyclic AMP and lactose levels are both high within the cell. For a repressible operon to be transcribed, which of the following must occur? - correct answer RNA polymerase must bind to the promoter, and the repressor must be inactive. Which of the following, when taken up by the cell, binds to the repressor so that the repressor no longer binds to the operator? - correct answer Inducer What is a promoter? - correct answer Sequence where the RNA polymerase binds and begins transcription. It is upstream of the sequence encoding the protein Which of the following is a protein produced by a regulatory gene? - correct answer Repressor What is a corepressor? - correct answer A small molecule that combines with and activates a repressor produced by a regular gene What is an operator? - correct answer A regulatory sequence that a repressor can bind to