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WorksheetsEnyzmes
Total questions: 23
Worksheet time: 22mins
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.
Most enzymes are
a)
nucleic acids
b)
proteins
c)
lipids
d)
carbohydrates
5.
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
6.
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
7.
Enzymes speed up reaction rates by changing...
a)
Activation Energy
b)
pH
c)
Hydrogen Bonds
d)
Kinetic Energy
8.
Letter D...
a)
active site
b)
enzyme
c)
substrate
d)
products
9.
Letter B...
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)
reusable
b)
catalyst
c)
specific
d)
fragile
13.
What 3 letters do enzymes typically end in?
a)
-ose
b)
-ase
c)
-ese
d)
-tic
14.
Any substance that is acted upon by an enzyme is called a(n)?
a)
Coenzyme
b)
Substrate
c)
Vitamin
d)
Polypeptide
15.
After the enzyme and substrate bind together and perform the reaction, what does the substrate become?
a)
a substrate
b)
an enzyme
c)
a product
d)
an active site
16.
In a chemical reaction, ________ are what you have at the end
a)
Products
b)
Molecules
c)
Reactants
d)
Substances
17.
An enzyme speeds up a chemical reaction in the cell but can only be used once. True or False?
a)
true
b)
false
18.
Which of these is NOT true?
a)
Enzymes can denature (change shape) when the temperature gets too high.
b)
Enzymes can only be used once in a chemical reaction.
c)
Extreme pH can denature enzymes.
d)
Enzymes speed up chemical reactions.
19.
What is the name for the mechanism of enzyme activity?
a)
Lock and key
b)
jigsaw puzzle
c)
hammer and nail
d)
two hands pattern
20.
What makes an enzyme substrate specific?
a)
Size
b)
Shape
c)
Name
d)
Location it is found in
21.
Which of the following can cause an enzyme to denature? (check all that apply)
a)
large change in pH (like adding acid to catalase)
b)
large change in temperature (like boiling catalase)
c)
water
d)
love
22.
In our lab we worked with what enzyme?
a)
lactase
b)
sucrase
c)
catalase
d)
insulin
23.
In our lab, our enzyme came from
a)
eggs
b)
bread
c)
carrots
d)
potatoes
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