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WorksheetsEnzymes
Total questions: 27
Worksheet time: 21mins
Name
Class
Date
1.
Enzymes are considered to be
a)
Lipids
b)
Carbohydrate
c)
Protein
d)
Nucleic Acid
2.
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
3.
Where do substrates bind on an enzyme?
a)
voltage-gated channels
b)
surface receptor
c)
calcium channels
d)
active site
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.
What is structure A?
a)
Substrate
b)
Active site
c)
Enzyme
d)
Products
6.
What is structure D?
a)
Substrate
b)
Active site
c)
Enzyme
d)
Products
7.
What is structure C?
a)
Substrate
b)
Active site
c)
Enzyme
d)
Products
8.
What is structure E, F, G?
a)
Substrate
b)
Active site
c)
Enzyme
d)
Products
9.
How do enzymes speed up chemical reaction?
a)
Increasing activation energy
b)
Decreasing activation energy
c)
Increasing deactivation energy
d)
Decreasing deactivation energy
10.
What is a substance called if it speeds up a chemical reaction?
a)
reusable
b)
catalyst
c)
specific
d)
fragile
11.
Each enzyme only has 1 substrate that will fit its active site. What is this called?
a)
reusable
b)
catalyst
c)
specific
d)
fragile
12.
Once a new product leaves an enzyme, the enzyme is unchanged and ready for the next substrate. 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.
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.
15.
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 .
16.
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
17.
The "lock and key hypothesis" attempts to explain the mechanism of?
a)
Vacuole formation
b)
Pinocytosis
c)
Sharing of electrons
d)
Enzyme specificity
18.
Which chemical is classified as an enzyme?
a)
Galactose
b)
Lipid
c)
Protease
d)
Manganese dioxide
19.
Any substance that is acted upon by an enzyme is called a(n)?
a)
Coenzyme
b)
Substrate
c)
Vitamin
d)
Polypeptide
20.
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
21.
What are the enzymes called when they are at low temperature?
a)
denatured
b)
Killed
c)
inactive
d)
normal
22.
How does an enzyme's activity change with increasing concentration of substrate?
a)
decreases
b)
stays the same
c)
no change
d)
increases
23.
the pH at which an enzyme is most efficient is called the _________ pH of an enzyme
a)
neutral
b)
optimum
c)
minimum
d)
experimental
24.
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
25.
Which of these do NOT affect enzyme activity?
a)
Temperature
b)
pH
c)
Competitive Inhibitors
d)
Carbohydrates
26.
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)
Enzymes can denature when the pH changes.
d)
Enzymes speed up chemical reactions.
27.
What is another name for enzymes?
a)
chemical catalyst
b)
microorganism
c)
biological catalyst
d)
catalyst
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