Exam 18: Regulation Of Gene Expression In Prokaryotes

Which of the following is a mechanism by which transcription is regulated? 1.Rapid turn-on and turn-off of gene expression in response to environmental changes 2)Preprogrammed circuits or cascades of gene expression 3)Light-switch method

Which of the following is the best example of derepression?

Which of the following is true regarding the regulation of the trp operon?

Where does the phage l repressor bind to prevent transcription of the lytic genes?

What type of regulation occurs when the product of the regulator gene is required to turn on the expression of one or more structural genes?

Which of the following statements regarding regulation of prokaryotic gene expression is incorrect?

Which of the following would most likely be controlled by a repressible gene?

Which of the following molecules would be made by a constitutive gene?

The lac repressor (I? gene product)controls the expression of structural genes located where?

In which type of operon does the free repressor binds to the operator,turning off transcription?

Enzymes that are involved in catabolic pathways are characteristically controlled by what type of genes?

Genes that are continually being expressed in most cells are referred to as

Which of the following is a constituent of the phage l repressor?

Which of the following best describes the lac operon?

Which of the following types of molecules controls whether or not a regulator can bind at the appropriate site?

How does catabolite repression stop transcription of the lac operon in the presence of glucose?

What happens in the lac operon when both lactose and glucose are present in the environment?