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2.4 Enzymes 2 2023

Total questions: 50

Worksheet time: 34mins

Name
Class
Date
1.
Where do substrates bind on an enzyme?
a)
voltage-gated channels
b)
surface receptor
c)
calcium channels
d)
active site
2.
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 .
3.

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)

Enzymes decrease the activation energy of the reaction.

d)

Enzymes reverse the direction of the reaction.

4.

When an enzyme denatures it means it can______________.

a)

function properly

b)

no longer function

c)

be okay

d)

need oxygen

5.
Based on the graph, what is the optimal temperature for this enzyme? 
a)
15oC
b)
40oC
c)
30oC
d)
35oC
6.

What does inhibit mean?

a)

To change the shape of an enzyme

b)

To slow or stop an enzyme from binding correctly with its substrate

c)

To create new products

d)

To destroy the substrate

7.

An enzyme could denature due to extreme temperatures or pH. Denature means ______________

a)

to unfold or change shape

b)

to make bigger

c)

to increase the function

d)

to speed up

8.

At what pH has the enzyme most likely becoming denatured?

a)

6

b)

7

c)

8

d)

9

9.

What happens when enzymes are heated to a high temperature?

a)

The enzymes die.

b)

The shapes of the enzyme are altered.

c)

The enzymes' amino acid sequence changes.

d)

The enzymes remain the same

10.

The enzyme on the left is working correctly. What is happening to the enzyme on the right?

a)

It is being denatured

b)

Nothing; it is working correctly

c)

It is being inhibited

d)

It is creating a product.

11.
With what 3 letters do enzymes typically end?
a)
-ose
b)
-ase
c)
-ese
d)
-tic
12.

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

13.
Which of these is most likely an enzyme?  
a)
Sucrose
b)
Galactose
c)
Fructose
d)
Amylase
14.
What happens to an enzyme when it is denatured?
a)
Activation energy is lowered.
b)
It becomes stronger.
c)
It loses its shape.
d)
Activation energy is raised.
15.
Enzymes are composed of which of the following monomers? 
a)
amino acids
b)
carbohydrates
c)
nucleotides
d)
monosaccharides
16.

An enzyme is heated until its shape changes and it no longer fits its substrate. The enzyme has been:

(a)  

17.

An enzyme has a small molecule blocking its active site. The enzyme has been:

(a)  

18.

Tick all the properties of enzyme.

a)

speed up metabolic reaction

b)

remain unchanged at the end of reaction

c)

made of fats

d)

known as biocatalysts

19.
What is the energy needed to start an chemical reaction referred to?
a)
Cascading Energy
b)
Potential Energy 
c)
Kinetic Energy
d)
Activation energy
20.
Where do substrates bind on an enzyme?
a)
voltage-gated channels
b)
surface receptor
c)
calcium channels
d)
active site
21.

Competitive inhibition involves a molecule, other than the substrate, binding to the enzyme’s _____ site.

a)

BInding

b)

Allosteric

c)

Kinetic

d)

Active

22.
How do enzymes speed up chemical reaction?
a)
Increasing activation energy
b)
Decreasing activation energy
c)
Increasing deactivation energy
d)
Decreasing deactivation energy
23.

Which of the following correctly describes enzyme structure and function?

a)

The shape of an enzyme is responsible for its function.

b)

All enzymes can bind to all substrates.

c)

The substrate is responsible for the shape of the enzyme.

d)

The location of an enzyme determines its function.

24.

Enzymes are biological ________________.

a)

agitators

b)

spurs

c)

catalysts

d)

stimulants

25.

Enzymes _________________________ chemical reactions without being changed.

a)

Speed up

b)

Slow down

c)

Stop

d)

Start

26.

The substance that an enzyme attaches to is called its _____________.

a)

Active Site

b)

Catalyst

c)

Product

d)

Substrate

27.

The new substances formed by an enzyme are called its ______________________.

a)

Substrate

b)

Active site

c)

Products

d)

Complex

28.

Enzymes bind to specific substrates. Because of this, each ______________ requires its own enzyme.

a)

active site

b)

reaction

c)

substrate

d)

cell

29.

Each enzyme works best under specific conditions. Each enzyme works best at a specific _______________________.

a)

Temperature, time

b)

pH, time

c)

Temperature, pH

d)

Time, place

30.

When temperature and pH change too much, enzymes become __________________ and stop working.

a)

devalued

b)

decomposed

c)

denatured

d)

debrided

31.

________________________ bind to enzymes and keep substrates from attaching. This keeps enzymes from working.

a)

Inhibitors

b)

Catalysts

c)

Active sites

d)

Proteins

32.

Enzymes often work together to complete processes. If even one enzyme stops working, the entire pathway is _____________.

a)

Accelerated

b)

Denatured

c)

Activated

d)

Disrupted

33.

What is the optimum pH of this enzyme?

(a)  

34.

What is the optimum temperature of this enzyme?

(a)  

35.

Which Graph shows that an enzyme works best at a pH of 4?

a)
b)
c)
d)
36.

Which Graph shows that an enzyme works best at a pH of 7?

a)
b)
c)
d)
37.

Which Graph shows that an enzyme works best in a NEUTRAL pH?

a)
b)
c)
d)
38.

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

a)
b)
c)
d)
39.

Which graph shows that an enzyme works best at 100 degrees?

a)
b)
c)
d)
40.

Which graph shows that the enzyme works best at 100 degrees?

a)
b)
c)
d)
41.

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

a)

A

b)

B

c)

C

42.

Which line shows that an enzyme works best at an ACIDIC pH?

a)

A

b)

B

c)

C

43.

Which Enzyme works best at a temperature of 37?

a)

Enzyme A

b)

Enzyme B

44.

Which Enzyme works best at a pH of 7.5?

a)

Enzyme A

b)

Enzyme B

45.

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

46.

Which substrate would this enzyme catalyze?

a)
b)
c)
d)
47.

What can we conclude from the graph? At a a pH of 3..

a)

Enzyme A works best

b)

Enzyme B works best

c)

Enzyme A works but low activity

d)

Enzyme B works but low activity

48.

What can we conclude from the graph? At a a pH of 8..

a)

Enzyme A works best

b)

Enzyme B works best

c)

Enzyme A works but low activity

d)

Enzyme B works but low activity

49.

What can we conclude from the graph? At a a pH of 6...

a)

Enzyme A works best

b)

Enzyme B works best

c)

Enzyme A works but low activity

d)

Enzyme B works but low activity

50.

What can we conclude from the graph? At a a pH of 10...

a)

Enzyme A works best

b)

Enzyme B works best

c)

Both enzymes are denatured

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