Gene Expression in Prokaryotes

The preferred carbon source in prokaryotes

• lactose

• glucose

• galactose

• fructose

A unit of bacterial gene expression and regulation

• operon

• exon

• intron

• cistron

A gene that codes for a product that controls the expression of other genes

• structural

• dominant

• regulatory

• repressible

A repressor protein binds to an operator to prevent a gene from being expressed in ________ regulation

• positive

• repressible

• inducible

• negative

The gene is regulated by the product of its enzyme pathway (the co-repressor) in _______ regulation

• inducible

• positive

• repressible

• negative

The lac operon is ____

• negative inducible

• negative repressible

• positive inducible

• positive repressible

The true inducer in lac operon

• glucose

• lactose

• cAMP

• galactose

The second layer of control of lac operon looks like a _____ regulation

• negative repressible

• negative inducible

• positive repressible

• positive inducible

In the second layer of control of lac operon the cAMP plays the role of ____

• co-repressor

• repressor

• inducer

• activator

The trp operon is

• negative inducible

• positive inducible

• negative repressible

• positive repressible