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- 1. Multiple Choice
What is the purpose of an enzyme?
control how many reactions occur
raise activation energy
give permission for the reaction
speed up chemical reactions
- 2. Multiple Choice
Where do substrates bind to an enzyme?
calcium channels
active site
receptor molecules
voltage-gated channels
- 3. Multiple Choice
The substance that binds to an enzyme is called a?
Polypeptide
Co-enzyme
Vitamin
Substrate
- 4. Multiple Choice
Which of the following best explains why enzymes are necessary for reactions in our cells?
The reactions are too slow to meet the needs of the cell if enzymes are missing.
Enzymes supply the oxygen necessary for the reactions.
Enzymes change reactants from solid to liquid during the reactions.
The reactions take up too much space in the cell if enzymes are missing.
- 5. Multiple Choice
The ____________________ hypothesis describes how each substrate must fit perfectly into the enzymes active site.
lock and key
hammer and nail
jigsaw puzzle
seesaw
- 6. Multiple Choice
The _____________________ hypothesis describes how an enzymes active site changes shape once the substrate is bonded.
hammer and nail
induced fit
jigsaw puzzle
lock and key
- 7. Multiple Choice
What is the optimal pH for this enzyme?
6
10
9
7
- 8. Multiple Choice
All of the following affect the functioning of an enzyme EXCEPT:
pH
temperature
metabolism
enzyme concentration, substrate concentration, inhibitor molecules
- 9. Multiple Choice
After the enzyme and substrate bind together and perform the reaction, what does the substrate become?
a substrate
an active site
an enzyme
a product
- 10. Multiple Choice
Enzymes are _______________ that _____________________ chemical reactions by ____________ the amount of activation energy required to start the reaction.
carbohydrates, slow down, lowering
proteins, speed up, increasing
lipids, speed up, lowering
proteins, speed up, lowering
- 11. Multiple Choice
What is the optimal temperature of this enzyme?
60
40
70
30
- 12. Multiple Choice
Is this reaction anabolic or catabolic?
Anabolic
Catabolic
- 13. Multiple ChoiceAt low temperatures enzyme activity declines because of:DenaturationDecreased Kinetic MotionIncreased H-BondingDissociation of Ionic Compounds
- 14. Multiple Choice
Molecules (often ions) that bind to enzymes to make them complementary to the substrate are called:
CoFactors
CoEnzymes
Allosteric Inhibitors
Allosteric Activators
- 15. Multiple Choice
Organic non-protein molecules that temporarily bind to the substrate or active site are called:
CoFactors
CoEnzymes
Allosteric Inhibitors
Allosteric Activators
- 16. Multiple ChoiceThe place, other than the active site, where activators and inhibitors bind to an enzyme is called the ________ site.competitiveallostericalteriorrate
- 17. Multiple Choice
Competitive inhibitors of enzymes work by
fitting into the active site.
fitting into a site other than the active site.
altering the shape of the enzyme.
changing the enzyme into an inactive form.
increasing the activation energy of the enzyme-catalyzed reaction.
- 18. Multiple Choice
An allosteric inhibitor
decreases the concentration of an inactive enzyme.
changes the shape of an enzyme.
increases the concentration of a product.
changes the shape of a substrate.
increases the concentration of an enzyme–substrate complex.
- 19. Multiple Choice
Which of the following is NOT an example of an inhibitor
Potassium cyanide
Asprin
End-product
Vitamin B3
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