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Enzymes quiz

Total questions: 31

Worksheet time: 27mins

Name
Class
Date
1.
The area that the substrate fits into on the enzyme is called the:
a)
Active Site
b)
Allosteric Site
c)
DiSulphide Bridge
d)
β-Pleated Sheet
2.
Enzymes catalyze reactions by ___________ Activation Energy.
a)
Increasing
b)
Decreasing
3.
Enzymes speed up reaction rates by changing:
a)
Activation Energy
b)
pH
c)
Hydrogen Bonds
d)
Kinetic Energy
4.
Most enzymes have the ending:
a)
-ase
b)
-ose
c)
-ic acid
d)
-ate
5.
The molecule an enzyme is working on is called the:
a)
Substrate
b)
Solvent
c)
Allosteric Inhibitor
d)
CoEnzyme
6.

Enzymes are considered to be _________ because they are made of amino acids.

a)

Lipids

b)

Carbohydrate

c)

Protein

d)

Nucleic Acid

7.
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
8.

Enzymes act as catalysts, meaning they...

a)

Speed up chemical reactions

b)

Slow down chemical reactions

c)

Reverse chemical reactions

d)

Cancel chemical reactions

9.

The substance on which an enzyme acts is the...

a)

activation energy

b)

active site

c)

substrate

d)

product

10.

The location on an enzyme where the substrates fits into the enzyme is the enzyme's...

a)

reaction site

b)

inhibitor site

c)

receptor site

d)

active site

11.

Enzymes are sensitive to extreme...

a)

Salt and sugar concentrations

b)

Heat and pressure

c)

Positive and negative charges

d)

Temperatures and pH

12.

Which number in the picture represents the enzyme?

a)

1

b)

2

c)

3

d)

4

13.

The "lock and key hypothesis" attempts to explain the mechanism of?

a)

Vacuole formation

b)

any substrate can bind to any enzyme

c)

Sharing of electrons

d)

Enzyme specificity (specific substrate bind to a specific enzyme)

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.
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
16.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
17.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
18.
Letter E...
a)
active site
b)
enzyme
c)
substrate
d)
products
19.

What do enzymes do?

a)

Build things up or break them down

b)

Help filter waste from the body

c)

Create environments where food can be eaten

d)

Add and remove water

20.

What does an enzyme need in order to work properly?

a)

The right amount of oxygen & CO2

b)

The right temperature & amount of water

c)

The right temperature & pH

d)

The right temperature & pressure

21.

Enzymes are specific. This means that an enzyme only works with molecules that are....

a)

the right size and shape

b)

broken down already

c)

present in water

d)

too big for the body to handle

22.
What is a substance called if it speeds up a chemical reaction?
a)
reusable
b)
catalyst
c)
specific
d)
fragile
23.
In the diagram, what is letter A? 
a)
product
b)
substrate
c)
enzyme-substrate complex
d)
active site
24.
An enzyme speeds up a reaction by
a)
lowering the activation energy.
b)
raising the activation energy.
c)
releasing energy.
d)
absorbing energy.
25.

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

26.
Letter C...
a)
active site
b)
enzymes
c)
substrate
d)
products
27.
Based on the graph, what temperature does this enzyme work best? 
a)
15 C
b)
40 C
c)
30 C
d)
47 C
28.
Enzymes will make a reaction go _______ and use ______ energy.
a)
faster, less
b)
faster, more
c)
slower, less
d)
slower, more
29.
Enzymes are composed of which of the following monomers? 
a)
amino acids
b)
carbohydrates
c)
nucleotides
d)
monosaccharides
30.
Each enzyme only has 1 substrate that will fit its active site.  What is this called?
a)
reusable
b)
catalyst
c)
specific
d)
fragile
31.
What 3 letters do enzymes typically end in?
a)
-ose
b)
-ase
c)
-ese
d)
-tic

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