Operon

Front

A protein that binds to the operator and blocks the RNA polymerase

Back

repressor

Front

The lac operon genes only become expressed if:

Back

lactose binds to the repressor

Front

In the lac operon model, when will the genes within the operon be expressed?

Back

lactose is present in the cell

Front

Operons are found in the cells of which type of organisms?

Back

prokaryotes (bacteria)

Front

What is an operon?

Back

A unit made up of linked genes that code for proteins needed to do a specific task.

Front

What does the lactose do to the Operon?

Back

Allows the repressor to be unbinded from the Operator.

Front

Which condition leads to maximal expression of the lac operon?

• lactose present, glucose absent
• lactose present, glucose present
• lactose absent, glucose absent
• lactose absent, glucose present

Back

lactose present, glucose absent

Front

What happens to lac operon in the absence of lactose?

Back

lac operon is switched off

Front

Who formulated the operon model?

Back

Jacob and Monod