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- 1. Multiple Choice
An enzyme is a
carbohydrate.
protein.
lipid.
nucleic acid.
- 2. Multiple Choice
The region on the surface of the enzyme that the substrate binds to is the
active site.
activation energy.
lock-and-key model.
catalysis.
- 3. Multiple Choice
What suffix is commonly applied to enzymes?
-ase
-ose
-ter
-ice
- 4. Multiple Choice
Enzymes act as catalysts to __________ the rate of a biochemical reaction by ___________ the activation energy needed for the reaction to occur.
increase, lowering
decrease, lowering
increase, raising
decrease, raising
- 5. Multiple Choice
According to the induced fit model, as a substrate approaches an enzyme, it induces a ______________ in the active site.
conformational change
chemical change
color change
- 6. Multiple Choice
The coming together of a substrate and the enzyme's active site is known as
collision.
activation energy.
denaturation.
increasing pH.
- 7. Multiple Choice
Collisions are the result of _______ of the substrate and enzyme. Successful collisions are ones in which the substrate and active site correctly ______.
random movements, align
repulsion, repel
cooling, attract
denaturation, match up
- 8. Multiple Choice
After an enzyme is denatured, the substrate can ______ to the active site.
bind
no longer bind
- 9. Multiple Choice
Low temperatures result in _______ thermal energy for the activation of an enzyme-catalyzed reaction.
insufficient
overabundant
- 10. Multiple Choice
As temperature increases toward the optimal level, the kinetic energy of the enzyme and substrate ________, resulting in ________ collisions.
increases, more frequent
increases, less frequent
decreases, more frequent
decreases, less frequent
- 11. Multiple Choice
At temperatures above the optimum temperature, enzyme stability will _______ as the thermal energy disrupts _______ bonds.
decrease, hydrogen
decrease, ionic
increase, hydrogen
increase, ionic
- 12. Multiple Choice
The loss of enzyme shape is called
denaturation.
stress.
random movement.
alignment.
- 13. Multiple Choice
T/F: All enzymes have the same optimum pH range.
true
false
- 14. Multiple Choice
The graph for substrate concentration vs enzyme activity plateaus because
all active sites are full and the enzymes are working at their maximum efficiency.
the enzymes are used up and there aren't any left.
- 15. Multiple Choice
Enzymes used in industry are commonly
immobilized.
replaced after every catalysis reaction.
unstable.
unconcentrated.
- 16. Multiple Choice
_______ is the enzyme that hydrolyzes _______ into glucose and galactose.
Lactase, lactose
Lactose, lactase
- 17. Multiple Choice
The enzyme catalase hydrolyzes H2O2 (hydrogen peroxide) into what products?
H2O + O2
H2O2 + O2
CO2 + O2
NH3 + O2
- 18. Multiple ChoiceIn the diagram, what is letter A?productsubstrateenzyme-substrate complexactive site
- 19. Multiple ChoiceEnzymes are...nucleic acidsproteinslipidscarbohydrates
- 20. Multiple ChoiceWhich substrate would this enzyme catalyze?Δσ∅μ
- 21. Multiple ChoiceWhat makes an enzyme substrate specific?SizeShapeNameLocation it is found in
- 22. Multiple ChoiceWhich of these is NOT true?Enzymes can denature (change shape) when the temperature gets too high.Enzymes can only be used once in a chemical reaction.Extreme pH can denature enzymes.Enzymes speed up chemical reactions.
- 23. Multiple ChoiceWhat is indicated by letter A?enzymeproductsubstrateactive site
- 24. Multiple ChoiceHow do competitive inhibitors affect enzymes?It binds to the active site, blocking the substrateIt changes the shape of the enzymeIt increases the activation energyIt decreases the activation energy
- 25. Multiple Choice
Non-competitive inhibition involves a molecule binding to a ______ site.
Active
Allosteric
Accompanying
Applied
- 26. Multiple Choice
Competitive inhibition involves a molecule, other than the substrate, binding to the enzyme’s _____ site.
BInding
Allosteric
Kinetic
Active
- 27. Multiple Choice
What colour line represents non-competitive inhibition?
Green
Orange
Blue
- 28. Multiple Choice
Which colour line represents competitive inhibition?
Green line
Orange line
Blue line
- 29. Multiple Choice
A metabolic pathway consists of ...
a series of reactions
a series of enzymes
a series of enzyme-controlled chemical reactions
a series of biological reactions
- 30. Multiple Choice
Two features of anabolic reaction sequences are...
Breakdown of molecules & requires energy
Breakdown of molecules & Releases energy
builds up molecules & releases energy
builds up molecules & requires energy
- 31. Multiple Choice
Two features of catabolic reaction sequences are...
Breakdown of molecules & requires energy
Breakdown of molecules & Releases energy
builds up molecules & releases energy
builds up molecules & requires energy
- 32. Multiple Choice
The change in shape of the active site of an enzyme, when its substrate binds, is called...
specificity
induced fit
activation
inhibition
- 33. Multiple Choice
Which type of inhibition involves an inhibitor with a similar shape to the substrate?
End product
Competitive
Non-competitive
Lead
- 34. Multiple Choice
Which type of inhibition can be overcome by increasing substrate concentration
End product
competitive
non-competitive
No type
- 35. Multiple Choice
Which type of inhibition changes the shape of the active site?
End product
Competitive
Non-competitive
Alternative pathway
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