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- 1. Multiple Choice
An enzyme speeds up a reaction bylowering the activation energy.raising the activation energy.releasing energy.absorbing energy. - 2. Multiple ChoiceIn a chemical reaction, a reactant binds to an enzyme at a region known as thecatalyst.product.substrate.active site.
- 3. Multiple Choice
What are the substances that are created by a chemical reaction?
Products
Reactants
Molecules
Ingredients
- 4. Multiple Choice
The energy needed to start a reaction is called the
activation energy
starting energy
promoting energy
reacting energy
- 5. Multiple Choice
Once an enzyme has helped a reaction take place, it can then
be reused for another reaction with the same reactants.
be broken down.
be stored in the cell until it is needed again.
be used to help different reactants go through a reaction.
- 6. Multiple Choice
What type of macromolecules does an enzyme belong?
Protein
Carbohydrate
Lipid
Nucleic Acid
- 7. Multiple ChoiceAn enzyme fits its substrate likea lock and keypeas and carrotsa product and reactant
- 8. Multiple ChoiceWhat is the purpose of an enzyme?give permission for the reactionraise activation energyspeed up reactionscontrol how many reactions occur
- 9. Multiple ChoiceAfter the enzyme and substrate bind together and perform the reaction, what does the substrate become?a substratean enzymea productan active site
- 10. Multiple ChoiceIn the diagram, what is letter A?productsubstrateenzyme-substrate complexactive site
- 11. Multiple Choice
The graph shows how enzymes affect reactions in cells. Which statement best summarizes the information shown in the graph?
Enzymes increase the energy of the reactants.
Enzymes decrease the energy level of the products.
Enzyme decrease the activation energy of the reaction.
Enzymes reverse the direction of the reaction.
- 12. Multiple ChoiceBased on the graph, what is the optimal temperature for this enzyme?15oC40oC30oC35oC
- 13. Multiple Choice
Which letter represents the enzyme-substrate complex?
A
B
C
D
- 14. Multiple Choice
Which letter represents the Product ?
B
C
D
E
- 15. Multiple Choice
Which of the following factors affect the action of enzymes to a substrate?
pH and temperature
color and light
salinity and temperature
acidity and oxygen level
- 16. Multiple Choice
What is the optimal pH for this enzyme?
6
10
9
7
- 17. Multiple Choice
Which color line represent a reaction with an enzyme present?
Blue
Red
Both
Neither
- 18. Multiple ChoiceThe graph below shows how the activity of an enzyme changes over a range of pH values. Which of the following conclusions can be drawn from this graph?The optimum pH of the enzyme is 6.6.The optimum pH of the enzyme is 5.8The enzyme’s activity continually increases as pH increases from 5.0 to 9.0The enzyme’s activity is greater around pH of 8.0 than around pH of 5.0.
- 19. Multiple ChoiceWhat is a substance called if it speeds up a chemical reaction?reusablecatalystspecificfragile
- 20. 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
- Answer choicesTagsAnswer choicesTags