Lac Operon

Lac Operon

CLIL with Claudia

Multiple Choice

The lac repressor protein encoded by the i gene is expressed in the absence or presence of what?

• The lac repressor protein is expressed in the absence or presence of Lacoste.

• The lac repressor protein is expressed in the absence or presence of lactose.

• The lac repressor protein is expressed in the absence or presence of Lactaid.

• The lac repressor protein is expressed in the absence or presence of glucose.

Multiple Choice

In the absence of lactose, the lac repressor binds to the lac operator site. What is the result?

• The corresponding proteins bind to the DNA roadblock.

• The proteins are made.

• The progression of RNA polymerase is allowed to continue.

• The progression of RNA polymerase is blocked.

Multiple Choice

The lac operon is repressed, and RNA polymerase is blocked in this example. Is lactose present or absent?

• The lac operon is repressed because lactose is absent.

• The lac operon is repressed because lactose is present.

Multiple Choice

What has Lactose bound to?

• The lac repressor

• Two crossed fingers

• The i gene

• RNA polymerase progression

Poll

The lac repressor protein encoded by the i gene is expressed in the absence or presence of lactose.

• true

• false