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Enzymes1

Total questions: 43

Worksheet time: 19mins

Name
Class
Date
1.

The substance that binds to an enzyme is called a?

a)

Polypeptide

b)

Co-enzyme

c)

Vitamin

d)

Substrate

2.

Which of the following best explains why enzymes are necessary for reactions in our cells?

a)

The reactions are too slow to meet the needs of the cell if enzymes are missing.

b)

Enzymes supply the oxygen necessary for the reactions.

c)

Enzymes change reactants from solid to liquid during the reactions.

d)

The reactions take up too much space in the cell if enzymes are missing.

3.

Changes in pH and temperature can ___________________ an enzyme which causes it to lose its shape and affects its function.

a)

puncture

b)

denature

c)

double

d)

delete

4.

What is the optimal pH for this enzyme?

a)

6

b)

10

c)

9

d)

7

5.

The ____________________ mechanism describes how each substrate must fit into the enzyme.

a)

lock and key

b)

hammer and nail

c)

jigsaw puzzle

d)

seesaw

6.

The _____________________ mechanism describes how an enzyme changes shape once the substrate is bonded.

a)

hammer and nail

b)

induced fit

c)

jigsaw puzzle

d)

lock and key

7.

What is the purpose of an enzyme?

a)

control how many reactions occur

b)

raise activation energy

c)

give permission for the reaction

d)

speed up chemical reactions

8.

Where do substrates bind to an enzyme?

a)

calcium channels

b)

active site

c)

receptor molecules

d)

voltage-gated channels

9.

Once a new product leaves an enzyme, the enzyme is unchanged and ready for the next substrate. What is this called?

a)

fragile

b)

reusable

c)

specific

d)

catalyst

10.

All of the following affect the functioning of an enzyme EXCEPT:

a)

pH

b)

temperature

c)

metabolism

d)

enzyme concentration, substrate concentration, inhibitor molecules

11.

After the enzyme and substrate bind together and perform the reaction, what does the substrate become?

a)

a substrate

b)

an active site

c)

an enzyme

d)

a product

12.

Enzymes are _______________ that _____________________ chemical reactions by ____________ the amount of activation energy required to start the reaction.

a)

carbohydrates, slow down, lowering

b)

proteins, speed up, increasing

c)

lipids, speed up, lowering

d)

proteins, speed up, lowering

13.
This reaction shows a(n) ____________ reaction
a)
Catabolic
b)
Anabolic
c)
Dehydration Synthesis
d)
Halogenation
14.
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
15.
Enzymes catalyze reactions by ___________ Activation Energy.
a)
Increasing
b)
Decreasing
16.
At high temperatures enzyme activity declines because of:
a)
Denaturation
b)
Decreased Kinetic Motion
c)
Increased H-Bonding
d)
Dissociation of Ionic Compounds
17.
At low temperatures enzyme activity declines because of:
a)
Denaturation
b)
Decreased Kinetic Motion
c)
Increased H-Bonding
d)
Dissociation of Ionic Compounds
18.
Most enzymes have the ending:
a)
-ase
b)
-ose
c)
-ic acid
d)
-ate
19.
The molecule an enzyme is working on is called the:
a)
Substrate
b)
Solvent
c)
Allosteric Inhibitor
d)
CoEnzyme
20.
When a molecule can occupy the same active site as the substrate, a situation called __________________ can result
a)
Competitive lnhibition
b)
Allosteric Regulation
c)
Non-Competitive Inhibition
d)
Feedback Inhibition
21.
A receptor site that a molecule can bind to that changes the shape of the active site is called a(n):
a)
Allosteric Site
b)
Active Site
c)
DiSulphide Bridge
d)
MHC Receptor
22.
A molecule binds to an enzyme and opens the active site so it can bind to the substrate. This is called:
a)
Allosteric Activation
b)
Allosteric Inhibition
c)
Competitive Activation
d)
Competitive Inhibition
23.
A molecule binds to an enzyme and decreases the ability of the active site to bind to the substrate. This is called:
a)
Allosteric Activation
b)
Allosteric Inhibition
c)
Competitive Activation
d)
Competitive Inhibition
24.
Molecules that bind to enzymes and enhance an enzyme's ability are called:
a)
CoFactors
b)
CoEnzymes
c)
Allosteric Inhibitors
d)
Allosteric Activators
25.
Organic molecules that temporarily bind to enzymes and enhance an enzyme's ability are called:
a)
CoFactors
b)
CoEnzymes
c)
Allosteric Inhibitors
d)
Allosteric Activators
26.
An enzyme that changes glucose into fructose would be a(n):
a)
Isomerase
b)
Lyase
c)
Oxidoreductase
d)
Transferase
27.
Each enzyme only has 1 substrate that will fit its active site.  What is this called?
a)
reusablility
b)
denaturation
c)
specificity
d)
fragility
28.

Enzymes in your body probably work best at which of the following temperatures>

a)

25oC

b)

98oC

c)

37oC

d)

210oC

29.

What is cofactor?

a)

A non-protein portion that is required for proper functioning of an enzyme.

b)

A protein that is required for proper functioning of an enzyme.

c)

A non-protein portion that decreases the rate of reaction of the enzyme.

d)

A protein that decreases the rate of reaction of the enzyme.

30.

Most coenzymes may be included in classes of foodstuffs known as:

a)

Minerals

b)

Fats

c)

Vitamins

d)

Metallic ions

31.

A metal ion activator is differentiated from the broader class of cofactors because it is _____.

a)

organic

b)

inorganic

c)

neutral

d)

toxic

32.

What impedes enzymatic reactions by binding to the enzyme and causes conformational changes of the active site?

a)

non-competitive inhibitor

b)

competitive inhibitor

c)

coenzymes

d)

cofactors

33.

Most synthetic reactions in which carbon dioxide is used require the vitamin biotin.

The biotin becomes covalently bound to a lysine molecule that is part of an enzyme, and the biotin can then attach to and carry the carbon dioxide molecule.

Biotin is best referred to as (a)  

34.

What is Y ?

a)

apoenzyme

b)

holoenzyme

35.

The enzyme carbonic anhydrase found in the blood has a prosthetic group containing

a)

Cl-

b)

Cl2-

c)

Zn2+

d)

Zn2-

36.

Vitamin precursor of FAD and NAD are

a)

Thiamine and Niacin

b)

Niacin and pantothenic acid

c)

Ascorbic acid and Folic acid

d)

Riboflavin and Niacin

37.

Coenzyme A in involved in

a)

Proton transfer

b)

oxidation-reduction reaction

c)

Acylation reaction (acetyl group transfer)

d)

all of the above

38.

coenzyme of carbonic anhydrase is..

a)

Mg

b)

Zn

c)

Mn

d)

Se

39.

Transamination reactions involve

a)

TPP

b)

PLP

c)

FAD

d)

NAD

40.

Vitamin precursor of Coenzyme A is..

a)

Nicotinic acid

b)

Pantothenic acid

c)

ascorbic acid

d)

Pyruvic acid

41.

Which if the Vitamin can be synthesized in body by tryptophan?

a)

Riboflavin

b)

Niacin

c)

Thiamine

d)

Pantothenic acid

42.

These reactions occur when smaller molecules are bound together to create larger ones

a)

activation energy

b)

peptide bond

c)

anabolic reaction

d)

catabolic reaction

43.

NAD+ is the example of

a)

metal ions

b)

coenzyme

c)

prosthetic group

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