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Enzymes

Total questions: 15

Worksheet time: 17mins

Name
Class
Date
1.

What is the substance called that speeds up a chemical reaction?

a)

Reusable

b)

Catalyst

c)

Specific

d)

Fragile

2.
With what 3 letters do enzymes typically end?
a)
-ose
b)
-ase
c)
-ese
d)
-tic
3.

Enzymes are an example of __________?

a)

Lipids

b)

Carbohydrate

c)

Protein

d)

Nucleic Acid

4.

An enzyme speeds up a reaction by______?

a)

Lowering the activation energy.

b)

Raising the activation energy.

c)

Releasing energy.

d)

Absorbing energy.

5.

What happens when enzymes are heated to a high temperature?

a)

The enzymes die.

b)

The shape of the enzyme are changed and it denatures.

c)

The enzymes' amino acid sequence changes.

d)

The enzymes remain the same.

6.
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.
7.
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 .
8.
An enzyme speeds up a chemical reaction in the cell but can only be used once.  True or False? 
a)

True

b)

False

9.
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.

10.
Which of these is most likely an enzyme?  
a)
Sucrose
b)
Galactose
c)
Fructose
d)
Amylase
11.
Enzymes are composed of which of the following monomers? 
a)

Amino acids

b)

Glycerol + Fatty acids

c)

Nucleotides

d)

Monosaccharides

12.
What is indicated by letter A?
a)

Enzyme

b)

Product

c)

Substrate

d)

Active site

13.

What is indicated by letter C?

a)

Enzyme

b)

Product

c)

Substrate

d)

Active site

14.

What is indicated by letter B?

a)

Enzyme

b)

Product

c)

Substrate

d)

Active site

15.
Where do substrates bind on an enzyme?
a)

Voltage-gated channels

b)

Surface receptor

c)

Calcium channels

d)

Active site

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