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Biology A---enzyme review

Total questions: 20

Worksheet time: 25mins

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)

substrate

b)

cell membrane

c)

protein channel

d)

active site

4.
What happens when enzymes are heated to a high temperature?
a)
The enzymes die.
b)
The shapes of the enzyme are altered or denatured
c)
The enzymes' amino acid sequence changes.
d)
The enzymes remain the same
5.
Based on the graph, what temperature does this enzyme work best? 
a)
15 C
b)
40 C
c)
30 C
d)
47 C
6.
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 .
7.
Letter D...
a)
active site
b)
enzyme
c)
substrate
d)
products
8.
Letter B...
a)
active site
b)
enzyme
c)
substrate
d)
products
9.
Letter C...
a)
active site
b)
enzymes
c)
substrate
d)
products
10.
Letter E...
a)
active site
b)
enzyme
c)
substrate
d)
products
11.
What is the energy needed to start an chemical reaction referred to?
a)
Cascading Energy
b)
Potential Energy 
c)
Kinetic Energy
d)
Activation energy
12.
Enzymes are able to speed up chemical reactions because they - 
a)
increase the temperature inside the cell
b)
reduce the friction between the reactants
c)
make the raw materials more chemically reactive
d)
lower the activation energy of the reaction
13.
After the enzyme and substrate bind together and perform the reaction, what does the substrate become?
a)
another substrate
b)
an enzyme
c)
a product
d)
an active site
14.

Are enzymes "USED UP" in a chemical reaction?

a)

no

b)

yes

15.

Enzymes are "Specific" which best describes this?

a)

function best under certain environmental conditions

b)

speeds up only one type of reaction. (Like a lock and key!!!) Example: Amylase – only breaks down starches.

c)

can catalyze the same reaction over and over again.

16.

When an enzyme's active site gets deformed and loses its specific shape and ability to function.

a)

denatured

b)

deformed

c)

dematured

d)

denoted

17.

Enzymes shapes and substrates shapes fit together like....

a)

round peg & a square hole

b)

Lock and a key

c)

a mini USB charger in an iphone

d)

Oreos and Water

18.

Which graph shows that an enzyme works best at 15 degrees?

a)
b)
c)
d)
19.

Which line shows that an enzyme works best at a pH pf 9?

a)

A

b)

B

c)

C

20.

What can we conclude from the graph? At a temperature of 62 ...

a)

Enzyme activity is highest

b)

Enzyme activity is low but working

c)

Enzyme is denatured

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