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Enzymes and the Factors that Affect Them

Total questions: 32

Worksheet time: 32mins

Name
Class
Date
1.
What is a substance called if it speeds up a chemical reaction?
a)
reusable
b)
catalyst
c)
specific
d)
fragile
2.
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.
3.
Based on the graph, what is the optimal temperature for this enzyme? 
a)
15oC
b)
40oC
c)
30oC
d)
35oC
4.
In the diagram, what is letter A? 
a)
product
b)
substrate
c)
enzyme-substrate complex
d)
active site
5.
Enzymes are...
a)
nucleic acids
b)
proteins
c)
lipids
d)
carbohydrates
6.
What is the function of an enzyme?
a)
enzymes break themselves into small pieces
b)
enzymes slow down chemical reactions
c)
enzymes speed up chemical reactions
d)
enzymes combine products to form reactants 
7.
What happens when enzymes are heated to a high temperature?
a)
The enzymes die.
b)
The shapes of the enzyme are altered denature
c)
The enzymes' amino acid sequence changes.
d)
The enzymes remain the same
8.
Enzymes speed up reaction rates by changing...
a)
Activation Energy
b)
pH
c)
Hydrogen Bonds
d)
Kinetic Energy
9.
Letter D...
a)
active site
b)
enzyme
c)
substrate
d)
products
10.
Letter C...
a)
active site
b)
enzymes
c)
substrate
d)
products
11.
Letter E...
a)
active site
b)
enzyme
c)
substrate
d)
products
12.
Each enzyme only has 1 substrate that will fit its active site.  What is this called?
a)
reusablility
b)
denaturation
c)
specificity
d)
fragility
13.
With what 3 letters do enzymes typically end?
a)
-ose
b)
-ase
c)
-ese
d)
-tic
14.
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 .
15.
An enzyme speeds up a chemical reaction in the cell but can only be used once.  True or False? 
a)
true
b)
false
16.
Which of these is most likely an enzyme?  
a)
Sucrose
b)
Galactose
c)
Fructose
d)
Amylase
17.

CHALLENGE QUESTION: Which enzyme is most efficient in a basic solution?

a)

A

b)

B

18.
Each enzyme only has 1 substrate that will fit its active site.  What is this called?
a)
reusable
b)
catalyst
c)
specific
d)
fragile
19.
In a chemical reaction, bonds are broken and new bonds are formed that create new substances. The bonds that are broken are called what?
a)
Reactants
b)
Products
c)
Atoms
d)
Catalysts
20.

CHALLENGE QUESTION: Chemical reactions always involve

a)

the breaking of bonds in reactants.

b)

the formation of new bonds in products.

c)

the breaking of bonds in reactants and the formation of new bonds in products.

d)

enzymes.

21.
The pH scale is a range from:
a)
1-7
b)
0-14
c)
1-5
d)
1-20
22.
A(n) ______ is a substance with a pH less than 7
a)
Acid
b)
Alkaline
c)
Base
d)
Buffer
23.
A(n) _______ is a substance with a pH greater than 7.
a)
Base
b)
Acid
c)
Buffer
d)
Water
24.
Complete the sentence.
A substance that is more basic has a _____ pH than a substance that is acidic.
a)
lower
b)
higher
c)
the same
d)
none of the above
25.

A base is a substance

a)

That releases OH- ions when dissolved in water

b)

That releases H+ ions when dissolved in water

c)

Does not release any ions when dissolved in water

d)

None of the above

26.

TOUGH CHALLENGE QUESTION: A solution has a pH of 7.0. What would happen to the pH if H ions were added?

a)

pH would go up

b)

pH would go down

c)

pH would stay the same

d)

None of these

27.

Which of the following two factors affect an enzyme's operation the most?

a)

amount of light and pressure

b)

blood glucose level and pH

c)

amount of light and temperature

d)

temperature and pH

28.

All cells contain exactly the same types of enzymes

a)

True

b)

False

29.

Temperature and pH are two internal body conditions that could affect the enzymes activity.

a)

True

b)

False

30.

Changing the shape (such as overheating) of an enzyme results in the enzyme's loss of -

a)

ability to catalyze a reaction

b)

storage of inherited information

c)

net electrical charge

d)

storage of a large amount of chemical energy

31.

Refer to the figure above. What temperature would be considered the optimum temperature for this enzyme's activity rate?

a)

20 Degrees Celsius

b)

60 Degrees Celsius

c)

40 Degrees Celsius

d)

30 Degrees Celsius

32.

Which of the following is NOT a function of proteins?

a)

Make up antibodies

b)

Serve as catalysts that control the rate of chemical reactions in the cell

c)

Store genetic information

d)

Form parts of tissues such as bone and muscle

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