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Worksheets2: EOC Review Enzymes
Total questions: 20
Worksheet time: 27mins
Name
Class
Date
1.
The substance that binds to an enzyme is called a?
a)
Polypeptide
b)
Co-enzyme
c)
Vitamin
d)
Substrate
2.
Which of the following best explains why enzymes are necessary for reactions in our cells?
a)
The reactions are too slow to meet the needs of the cell if enzymes are missing.
b)
Enzymes supply the oxygen necessary for the reactions.
c)
Enzymes change reactants from solid to liquid during the reactions.
d)
The reactions take up too much space in the cell if enzymes are missing.
3.
What is the purpose of an enzyme?
a)
give permission for the reaction
b)
raise activation energy
c)
speed up reactions
d)
control how many reactions occur
4.
Enzymes are capable of increasing the rate of a chemical reaction within a living cell. Enzymes accomplish this through which of the following means?
a)
reducing the number of products
b)
reducing the activation energy
c)
increasing the temperature of the cell
d)
increasing the concentration of reactants
5.
In the diagram, what is letter A?
a)
product
b)
substrate
c)
enzyme-substrate complex
d)
active site
6.
What is structure A?
a)
Substrate
b)
Active site
c)
Enzyme
d)
Products
7.
The 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?
a)
The optimum pH of the enzyme is 6.6.
b)
The optimum pH of the enzyme is 5.8
c)
The enzyme’s activity continually increases as pH increases from 5.0 to 9.0
d)
The enzyme’s activity is greater around pH of 8.0 than around pH of 5.0.
8.
What is structure D?
a)
Substrate
b)
Active site
c)
Enzyme
d)
Products
9.
What is structure E, F, G?
a)
Substrate
b)
Active site
c)
Enzyme
d)
Products
10.
Which of the following conclusions can be drawn from this graph?
a)
The optimum pH of the enzyme is 6.6.
b)
The optimum pH of the enzyme is 5.8
c)
The enzyme’s activity increases as pH increases 5.0 to 9.0
d)
The enzyme’s activity is greater around pH of 8.0 .
11.
The graph shows how enzymes affect reactions in cells. Which statement best summarizes the information shown in the graph?
a)
Enzymes increase the energy of the reactants.
b)
Enzymes decrease the energy level of the products.
c)
Enzyme decrease the activation energy of the reaction.
d)
Enzymes reverse the direction of the reaction.
12.
What macromolecule includes enzymes?
a)
Lipids
b)
Carbohydrates
c)
proteins
13.
Enzymes need certain environmental conditions in order to function properly. What happens when enzymes are heated to a high temperature?
a)
they die
b)
they denature
c)
they change their amino acid sequence
d)
they work better
14.
What makes an enzyme substrate specific?
a)
Size
b)
Shape
c)
Name
d)
Location it is found in
15.
What factors affect an enzyme's reaction rate?
a)
temperature
b)
pH
c)
substrate concentration
d)
all of these
16.
Based on the graph, what is the optimal temperature for this enzyme?
a)
15oC
b)
40oC
c)
30oC
d)
35oC
17.
Enzymes speed up reaction rates by changing...
a)
Activation Energy
b)
pH
c)
Hydrogen Bonds
d)
Kinetic Energy
18.
Letter D...
a)
active site
b)
enzyme
c)
substrate
d)
products
19.
Letter B...
a)
active site
b)
enzyme
c)
substrate
d)
products
20.
The portion labeled "B" represents the
a)
reaction with enzyme
b)
reaction without enzyme
c)
reactants
d)
products
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