Bio final Leister slides 6 (LO 16)

Question 1

Inducable operon

Answer 1

-Catabolic
-Normally off
-Can be induced by inactivation of repressor
-Lac

Question 2

Repressible operon

Answer 2

-Anabolic
-Normally on
-Can be repressed when a co repressor binds repressor
-Trp

Question 3

Lac operon

Answer 3

-Promoter
-Operator
-Lac Z,Y, A

Question 4

Lactose absent

Answer 4

-Lac operon turned off
-Lac I repressor binds operator and blocks RNA polymerase
-REPRESSOR ACTIVE

Question 5

Lac present

Answer 5

-Lac operon turned on
-Allolactose binds repressor. Repressor can no longer bind operator.
-RNA polymerase can bind
-REPRESSOR INACTIVE

Question 6

Trp operon

Answer 6

-Promoter
-Operator
-Trp a,b,c,d,e (makes tryptophan)

Question 7

Tryptophan absent

Answer 7

-Trp operon turned on
-Nothing binding receptor

Question 8

Tryptophan present

Answer 8

-Trp operon turned off
-Tryptophan binds receptor and ACTIVATES it
-Binds operator
-RNA polymerase cant bind