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- 1. Multiple Choice
The substance that binds to an enzyme is called a?
Polypeptide
Co-enzyme
Vitamin
Substrate
- 2. 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.
- 3. Multiple Choice
Changes in pH and temperature can ___________________ an enzyme which causes it to lose its shape and affects its function.
puncture
denature
double
delete
- 4. Multiple Choice
What is the optimal pH for this enzyme?
6
10
9
7
- 5. Multiple Choice
The ____________________ mechanism describes how each substrate must fit into the enzyme.
lock and key
hammer and nail
jigsaw puzzle
seesaw
- 6. Multiple Choice
The _____________________ mechanism describes how an enzyme changes shape once the substrate is bonded.
hammer and nail
induced fit
jigsaw puzzle
lock and key
- 7. 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
- 8. Multiple Choice
Where do substrates bind to an enzyme?
calcium channels
active site
receptor molecules
voltage-gated channels
- 9. Multiple Choice
Once a new product leaves an enzyme, the enzyme is unchanged and ready for the next substrate. What is this called?
fragile
reusable
specific
catalyst
- 10. Multiple Choice
All of the following affect the functioning of an enzyme EXCEPT:
pH
temperature
metabolism
enzyme concentration, substrate concentration, inhibitor molecules
- 11. 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
- 12. Multiple Choice
A baby is locked in the car on a hot day. What is most likely to happen to the child?
The child's body will adjust and cause it to maintain homeostasis
The child's enzymes will denature causing chemical reactions to speed up in the body, which will lead to death.
The child's enzymes will denature causing chemical reactions to slow down in the body, which will lead to death.
The activation energy for chemical reactions will remain unchanged and therefore the child will live.
- 13. 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
- 14. Multiple Choice
What is the optimal temperature of this enzyme?
60
40
70
30
- 15. Multiple Choice
Which letter represents the product?
A
B
C
D
- 16. Multiple Choice
Which enzyme represents the substrate?
A
B
C
D
- 17. Multiple Choice
Which letter represents the enzyme?
A
B
C
D
- 18. Multiple Choice
Exothermic reactions:
release energy
absorb energy
- 19. Multiple Choice
Endothermic reactions:
release energy
absorb energy
- 20. Multiple Choice
Is this reaction exothermic or endothermic?
Endothermic
Exothermic
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