Advanced Placement Biology
(administered on _/_/2000)

Lac Operon Quiz:

Read each question carefully. Then choose the best answer from the choices provided.
After making your selection, please respond as to your "level of certainty."

Be certain that EACH group member's AIDE letters, the correct lab station and
the correct PERIOD have been entered before beginning the Quiz.

Enter each group member's AIDE letters
Lab Station #
Select period

Question 1   Which regulatory protein in the lac operon of Escherichia coli is sensitive to high concentrations of cAMP (low levels of glucose)?

Repressor protein
Allolactose
Catabolite Activator protein
Beta-Galactosidase
omit

How sure are you?
Absolutely Certain       More or Less Sure       Guess

Question 2  Which of the following molecules acts as the corepressor in the trp operon of Escherichia coli -- and participates in in a negative feedback loop that is capable of temporarily shutting down expression of the five genes comprising the operon?

Allolactose
Tryptophan
RNA Polymerase
Operator
omit

How sure are you?
Absolutely Certain       More or Less Sure       Guess

Question 3  The trp operon allows E. coli to manufacture the proteins needed to synthesize its own supply of ______________.

 

ATP
Tryptophan
Lactose
Allolactose
omit

How sure are you?
Absolutely Certain       More or Less Sure       Guess

Question 4  What molecule binds to the promoter site?

 

Allolactose
Repressor Protein
Activator Protein
RNA Ploymerase
omit

How sure are you?
Absolutely Certain       More or Less Sure       Guess

Question 5  Which molecule binds to the operator site?

 

Activator Protein
Cyclic AMP
Repressor Protein
omit

How sure are you?
Absolutely Certain       More or Less Sure       Guess

Question 6  Which molecule binds to the DNA and physically blocks transcription of an operon?

 

Repressor Protein
Activator Protein
Cyclic AMP
Lactose and/or Tryptophan
omit

How sure are you?
Absolutely Certain       More or Less Sure       Guess

Question 7  How does a cell benefit from regulatory control over expression of its genes?

 

Saves energy
Saves raw materials
Can respond to changes in the environment
All of the above
omit

How sure are you?
Absolutely Certain       More or Less Sure       Guess

Question 8  Are regulatory changes to gene expression reversible or not?

 

Yes, reversible.
No, they are not reversible.
They are usually reversible, but sometimes irreversible.

omit

How sure are you?
Absolutely Certain       More or Less Sure       Guess

Question 9  The fact that almost all cells on Earth employ the same genetic code is an example of ___________ in diversity.

 

regulatory capactiy
unity
complexity
heredity
omit

How sure are you?
Absolutely Certain       More or Less Sure       Guess

Question 10  During gene expression, which cell organelles act as sites of protein synthesis?

 

Ribosomes
Plasmodesmata
Mitochondria
Golgi apparatus
omit

How sure are you?
Absolutely Certain       More or Less Sure       Guess