Lac Operon

The lac repressor have which of the following DNA binding motif

• Zinc Finger

• Homodomain

• Leucine zipper

• Helix-turn-helix

A ____ often controls the transcription of prokaryote genes.

• hox gene

• interfering RNA

• operon

• protein complex

When will a lac operon be activated?

• Glucose is low and lactose is present

• Glucose is high and lactose is absent

• both glucose and lactose is high

• both glucose and lactose is low

Bacterial genes are organized into

• promotors

• operons

• regulator genes

• structural genes

Where does the RNA Polymerase bind to for the initiation of

• Regulator

• Structural genes

• Operator

• Promotor

Inducible operon s

• lac operon

• trp open

• bound to a repressor under normal conditions

• similar to competitive inhibition

The lac operon genes only become expressed if:

• lactose binds to the repressor

• glucose binds to the repressor

• lactose binds to the operator

• the repressor binds to the operator

Operons are found in the cells of which of the following types of organisms?

• prokaryotes (bacteria)

• eukaryotes (plant and animals)

• animals only

• viruses

What is 2 in the diagram?

• RNA polymerase

• Inducer

• Repressor

• Operator

In the lac operon model the genes within the operon will be expressed if:

• lactose is absent in the cell

• glucose is present in the cell

• lactose is present in the cell