Ch. 16 Control of Gene Expression in Prokaryotes

Question 1

Operons are found in…

Answer 1

prokaryotes

Question 2

What are the parts of an operon?

Answer 2

promoter
operator
structural genes

Question 3

RNA polymerase binds to the___

Answer 3

promoter

Question 4

What binds to the operator?

Answer 4

regulator protein

Question 5

True or False: the regulator gene is part of the operon

Answer 5

False

Question 6

Transcription is usually off and needs to be turned on

Answer 6

inducible

Question 7

Transcription is usually on and needs to be turned off

Answer 7

repressible

Question 8

The regulator protein is a repressor

Answer 8

negative

Question 9

The regulator protein is an activator

Answer 9

positive

Question 10

In negative inducible operons, the regulatory protein is made in an ___ state

Answer 10

active

Question 11

In negative repressible operons, the regulatory protein is made in an ___ state

Answer 11

inactive

Question 12

Where are inducer molecules found?

Answer 12

negative inducible

Question 13

Where are corepressor molecules found?

Answer 13

negative repressible

Question 14

inducer molecules ___ the regulatory protein

Answer 14

inactivate

Question 15

Corepressor molecules ___ the regulatory protein

Answer 15

activate

Question 16

Inducer molecules ___ transcription

Answer 16

increase

Question 17

Corepressor molecules ___ transcription

Answer 17

decrease

Question 18

What type of operon is the lac operon?

Answer 18

negative inducible

Question 19

What does Z code for?

Answer 19

beta-galactosidase

Question 20

What does Y code for?

Answer 20

permease

Question 21

What does A code for?

Answer 21

transacetylase

Question 22

What does beta-galacotisade do?

Answer 22

break lactose down

Question 23

What does permease do?

Answer 23

bring lactose into the cell

Question 24

What is the inducer molecule in lac operon?

Answer 24

allolactose

Question 25

What does I code for?

Answer 25

regulatory protein

Question 26

I- means the regulatory protein is

Answer 26

mutant

Question 27

I^s means the regulatory protein is

Answer 27

super-repressor

Question 28

In partial diploids, O is ___-acting

Answer 28

cis

Question 29

In partial diploids, I is ___-acting

Answer 29

trans

Question 30

In a normal lac operon in the absence of lactose, what is produced?

Answer 30

neither

Question 31

In a normal lac operon in the presence of lactose, what is produced?

Answer 31

both

Question 32

True or False: Catabolite repression is an example of positive control

Answer 32

True

Question 33

High levels of cAMP means ___ levels of glucose

Answer 33

low

Question 34

What is the name of protein in catabolite repression?

Answer 34

catabolite activator protein

Question 35

If there are high levels of cAMP…

Answer 35

transcription of lac increases