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Total questions: 102

Worksheet time: 6hrs 26mins

Name
Class
Date
1.

Which of the following helps enzyme to function well?

a)

Product

b)

Cofactor

c)

Inhibitor

d)

Substrate

2.

Diagram 5 shows the mechanism of enzyme action.

Which part labelled A, B, C and D represents the substrate?

a)

A

b)

B

c)

C

d)

D

3.

Diagram 5 shows the action of an enzyme on a substrate.

What is S if P is lactase, Q is lactose and R is glucose?

a)

maltose

b)

glucose

c)

fructose

d)

galactose

4.

Which of the following is an enzyme inhibitor?

a)

Iron

b)

Mercury

c)

Penicillin

d)

Vitamin B

5.

Which equation shows the enzymatic reaction in stomach?

a)

Starch + water --Amylase----> Maltose

b)

Protein + water --Pepsin--> Polypeptide

c)

Fat+ water --Lipase---> Fatty acids + Glycerol

d)

Lactose+ water --Lactase---> Glucose + Galactose

6.
What 3 letters do enzymes typically end in?
a)
-ose
b)
-ase
c)
-ese
d)
-tic
7.

Enzymes are

a)

Protiens

b)

Lipids

c)

Carbohydrates

d)

DNA

8.

On an enzyme, the site that attaches to a substrate

a)

Polypeptide

b)

Base

c)

Substrate

d)

Active site

9.
Many coenzymes are
a)
metals
b)
vitamins
c)
proteins
d)
substances
10.
How do enzymes speed up chemical reaction?
a)
Increasing activation energy
b)
Decreasing activation energy
c)
Increasing deactivation energy
d)
Decreasing deactivation energy
11.

Diagram shows a graph of the optimum pH of enzyme activity.

Which of the curves A,B,C or D represents the activity of pepsin?

a)

A

b)

B

c)

C

d)

D

12.

Diagram is a graph which shows the relationship between the rate of reaction and the substrate concentration when factor Y is varied.

What is factor Y?

a)

pH

b)

Time

c)

Inhibitor

d)

Enzyme concentration

13.
What is a substance called if it speeds up a chemical reaction?
a)
reusable
b)
catalyst
c)
specific
d)
fragile
14.
In the diagram, what is letter A? 
a)
product
b)
substrate
c)
enzyme-substrate complex
d)
active site
15.
What is the function of an enzyme?
a)
enzymes break themselves into small pieces
b)
enzymes slow down chemical reactions
c)
enzymes speed up chemical reactions
d)
enzymes combine products to form reactants 
16.
Where do substrates bind on an enzyme?
a)
voltage-gated channels
b)
surface receptor
c)
calcium channels
d)
active site
17.
What makes an enzyme substrate specific?
a)
Size
b)
Shape
c)
Name
d)
Location it is found in
18.
How do enzymes increase the speed of chemical reactions?
a)
reducing the number of products   
b)
reducing the activation energy
c)
increasing the temperature of the cell
d)
increasing the concentration of reactants 
19.
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
20.
Which chemical is classified as an enzyme?
a)
Galactose
b)
Lipid
c)
Protease
d)
Manganese dioxide
21.
What is indicated by letter A?
a)
enzyme
b)
product
c)
substrate
d)
active site
22.
How do competitive inhibitors affect enzymes?
a)
It binds to the active site, blocking the substrate
b)
It changes the shape of the enzyme
c)
It increases the activation energy
d)
It decreases the activation energy
23.

Reactions that build up molecules

a)

catabolic reaction

b)

anabolic reaction

c)

thermal expansion

d)

reactants and products

24.

Reactions that break down molecules

a)

anabolic

b)

burning

c)

catabolic

d)

thermal

25.

Combination of anabolic and catabolic reactions

a)

metastasis

b)

anacatabolism

c)

catabolism

d)

metabolism

26.

Biological catalysts speed up reactions are unchanged by the reaction

a)

firestarters

b)

products

c)

enzymes

d)

fuel

27.

Molecule the enzyme works on

a)

substrate

b)

product

c)

solvent

d)

enzyme

28.

Maltase is the enzyme that breaks apart

a)

maltose

b)

lactose

c)

sucrose

d)

Peptidase

29.

What happens when animals die

a)

Their nitrogen compounds dissipate into the air

b)

Their nitrogen compounds will return to the soil

c)

Their nitrogen compounds produce toxic gas

d)

Their nitrogen compounds combine with oxygen

30.

In which type of Inhibition where the inhibitor binds to the same active site of the substrate?

a)

Uncompetitive

b)

Non competitive

c)

Competitive

d)

All of the above

31.

Which domain of an enzyme is non-protein?

a)

Active site

b)

The stabilizing body

c)

The upper most region

d)

Co-factor

32.
A catalyst works by
a)
changing the order of the reaction
b)
increasing the temperature
c)
lowering the activation energy
d)
making the activated complex
33.

If the temperature is reduced to 27 degree celcius, a reaction rate will ______

a)

increase

b)

decrease

c)

stay the same

34.

If the concentration of a reactant is increased, the reaction rate will ___________.

a)

increase

b)

decrease

c)

stay the same

35.

Graph a is the normal enzyme plot of rate of reaction vs substrate concentration. Graph b and c are the graphs plotted with inhibitors. Graph ____ is a __________ type of inhibition with a lowered Vmax.

a)

b, competitive

b)

b, noncompetitive

c)

c, competitive

d)

c, noncompetitive

36.

In transamination, the NH2 group on one molecule is exchanged with the =O group on the other molecule. The amino acid becomes α-keto acid _____________, and α-keto acid becomes an α-amino acid _____________

a)

(anabolism), (catabolism)

b)

(catabolism), (anabolism)

c)

(anabolism), (biosynthesis)

d)

(catabolism), (breakdown)

37.

Molecule produced by enzymes

a)

catalyst

b)

product

c)

reactant

d)

enzyme

38.

Activation energy

a)

increases the amount of product

b)

increased using a catalyst

c)

lowered using a catalyst

d)

lowers the amount of product

39.

Amino acids joined together form

a)

peptides

b)

pepsi

c)

carbohydrates

d)

phospholipids

40.

Starch molecules are broken up into maltose (2 glucose molecules) before breaking into monomers of

a)

enzymes

b)

phospholipids

c)

amino acids

d)

glucose

41.

Fat molecules are made up of one glycerol molecule and three

a)

energy units

b)

fatty acid molecules

c)

amino acid molecules

d)

enzymes

42.

The arrow in a chemical reactions means

a)

go this way

b)

no reaction takes place

c)

reversible reaction

d)

change into

43.
Which substrate would this enzyme catalyze?
a)
Δ
b)
σ
c)
∅
d)
μ
44.
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
45.
can a change in pH alter the active site of an enzyme
a)
yes
b)
no
46.
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)
Extreme pH can denature enzymes.
d)
Enzymes speed up chemical reactions. 
47.
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
48.
Which of these do NOT affect enzyme activity?
a)
Temperature
b)
pH
c)
Competitive Inhibitors
d)
Carbohydrates
49.

How do enzymes speed up chemical reactions? Enzymes

a)

lower the activation energy of chemical reactions.

b)

raise the temperature of the cell, speeding chemical reactions.

c)

store ATP, allowing more energy to be used in chemical reactions.

d)

act as miniature "transfer trucks", gathering materials for chemical reactions, and placing them together.

50.

What is the optimum temperature for this enzyme?

a)

20 degrees Celsius

b)

45 degrees Celsius

c)

52 degrees Celsius

d)

64 degrees Celsius

51.

Which suffix (word ending) is used in the names of most enzymes?

a)

-ase

b)

-in

c)

-ine

d)

-ose

52.

What can be inferred using the graph?

a)

Cells can function equally as well at all pH values.

b)

Cells do not function well at pH values that are too high or too low.

c)

Cells function best at high pH values.

d)

Cells function best at low pH values.

53.

In the enzymatic reaction, the __________ is on the left of the arrow, while the products are to the right of the arrow.

a)

enzyme

b)

filtrate

c)

pre-product

d)

reactant

54.

Each enzyme produced by the body is

a)

open - meaning it is able to catalyze a reaction with any molecule.

b)

immature - meaning it cannot catalyze a reaction until many years later.

c)

incomplete - meaning it requires other parts before it is able to bind to a molecule.

d)

specific - meaning it is only able to catalyze a rection with a certain molecule.

55.

Which of the following two factors affect an enzyme's operation the most?

a)

amount of light and temperature

b)

blood glucose and pH

c)

temperature and pH

d)

amount of light and pressure

56.

What substances are formed as a result of this reaction?

a)

hydrogen peroxide and water

b)

water and oxygen

c)

hydrogen peroxide and oxygen

d)

water and ozone

57.

What is the optimum pH for the enzyme salivary amylase?

a)

2

b)

5

c)

6.2

d)

9.1

58.

Enzymes are a type of which macromolecule?

a)

carbohydrate

b)

lipid

c)

protein

d)

nucleic acid

59.

Why are enzymes needed for life?

a)

They speed up all the chemical reactions in living things.

b)

They are the main proteins that make up our body structure.

c)

The provide energy to all living things.

d)

They provide genetic information.

60.

Which would be the enzyme that breaks down the starch amylose?

a)

amylase

b)

maltase

c)

lactase

d)

amylose

61.

What is activation energy?

a)

the energy from the sun

b)

the energy produced by an enzyme

c)

the energy needed to get a reaction going

d)

none of these

62.

What does it mean when an enzyme is denatured?

a)

that there is an acid around

b)

that the enzyme works faster

c)

that it is providing energy for the cell

d)

that the shape is changed of the active site & it no longer works

63.

Which labeled part is the substrate?

a)

letter A

b)

letter B

c)

letter D

d)

letter E

64.

Which labeled part is the enzyme?

a)

letter A

b)

letter B and D

c)

letter D

d)

letter E

65.

Which model describes the active site of the enzyme changing shape slightly to fit the substrate?

a)

'twisted ladder' model

b)

'estimation' model

c)

'induced fit' model

d)

'lock and key' model

66.

Which of the following describes the role that enzymes play in the process of metabolism?

a)

Enzymes carry the genetic instructions required for a cell to initiate metabolism.

b)

Enzymes increase the rate of the chemical reactions carried out during metabolism.

c)

Enzymes provide the chemical energy that is broken down and released during metabolism.

d)

Enzymes store the chemical energy that is used to construct nucleic acids during metabolism.

67.

In the lock-and-key model of enzyme action, the __________ fits into the __________ of the enzyme.

a)

product; substrate

b)

active site; product

c)

substrate; active site

d)

active site; substrate

68.

catalyst =

a)

enzyme used to break down nucleic acids

b)

substance that speeds up the rate of a chemical reaction

c)

minerals that assist in the normal functioning of enzymes

d)

the part of an enzyme where the substrate binds to the enzyme and where the chemical reaction occurs

69.

Where does the substrate bind on an enzyme?

a)

active site

b)

allosteric site

c)

binding site

d)

product site

70.
The ability to cause change or do work is known as
a)
metabolism
b)
ups
c)
energy
d)
enzymes
71.
Lactose, a sugar found in dairy products, is broken down by which major digestive enzyme?
a)
Amylase
b)
Lipase
c)
Protease
d)
Lactase
72.
Enzymes are proteins that are used to _________ chemical reactions in our bodies, by ____________ the activation energy needed.
a)
slow down, increasing
b)
slow down, decreasing
c)
speed up, increasing
d)
speed up, decreasing
73.
Which conclusion can be drawn from the following graph?
a)
the optimum pH of the enzyme is 6.6
b)
The enzyme’s activity increases as pH increases 5.0 to 9.0
c)
The optimum pH of the enzyme is 5.8
d)
The enzyme’s activity is greater around pH of 8.0 .
74.
The “lock and key” model of enzyme action illustrates that a particular, or specific, enzyme molecule
a)
forms a permanent enzyme-substrate complex.
b)
maybe destroyed and resynthesized several times.
c)
interacts only with a specific type of substrate molecule.
d)
reacts at identical rates under all conditions with all substrates.
75.
Chief cells are found in the glands that line the inside of the stomach. These cells secrete large amounts of enzymes to aid in food digestion. Which organelle will be more abundant in chief cells because of their production of protein macromolecules, which enzymes are a type of?
a)
Ribosomes
b)
Nuclear Envelope
c)
Cytoskeleton
d)
Cell Wall
76.
In the diagram, what is labeled as D?
a)
Enzyme-Substrate Complex
b)
Substrate
c)
Active Site
d)
Enzyme
77.
The molecule that binds to an enzyme to trigger a reaction is known as a...
a)
substrate
b)
active site
c)
inhibitor
d)
bubble gum
78.
According to the induced fit model, as a substrate approaches an enzyme, it induces a ______________ in the active site.
a)
temperature change
b)
shape change
c)
chemical change
79.
Which graph shows the effects of temperature on the activity of an enzyme?
a)
A
b)
B
c)
C
d)
D
80.
Enzymes are made all over our bodies, but one organ in our body is a major player in the production of these enzymes. It is the...
a)
pancreas
b)
liver
c)
heart
d)
lungs
81.
In the diagram, what is labeled as C?
a)
Enzyme-Substrate Complex
b)
Substrate
c)
Active Site
d)
Enzyme
82.
Of the 4 major digestive enzymes we discusses one breaks down carbohydrates which are then turned into sugars for our bodies, it is...
a)
Lipase
b)
Amylase
c)
Protease
d)
Lactase
83.
Based on the graph, what temperature does this enzyme work best?
a)
15 C
b)
30 C
c)
50 C
d)
45 C
84.
Explain the importance of eating food, in terms of enzymes, activation energy, and the chemical processes within our bodies.
4 lines
85.

What is the main energy carrier for life?

a)

Glucose

b)

Adenosine Triphosphate (ATP)

c)

Pyruvate

d)

Lactic Acid

86.

What happens to unusable energy in biological systems?

a)

It is stored for later use

b)

It is converted into usable energy

c)

It is transferred to other organisms

d)

It is released as heat

87.

What is metabolism?

a)

All of the chemical reactions in a cell

b)

The conversion of energy

c)

The transfer of energy

d)

The breakdown of glucose

88.

What is the role of enzymes in metabolic pathways?

a)

They convert energy into ATP

b)

They facilitate the breakdown of glucose

c)

They guide and catalyze each reaction step

d)

They store energy for later use

89.

What is ATP coupling?

a)

The process of coupling ATP hydrolysis with an unfavorable reaction

b)

The process of converting ATP into glucose

c)

The process of hydrolyzing ATP

d)

The process of converting glucose into ATP

90.

Which of the following is an example of energy transfer in the human body?

a)

Breathing air

b)

Thinking

c)

All of the above

d)

Digesting food

91.

What happens to the amount of usable energy available to do work in every energy transfer?

a)

It increases

b)

It decreases

c)

It remains constant

d)

It depends on the type of energy

92.

_____ is defined as the ability to do work.

a)

Enzyme

b)

Energy

c)

Work

d)

Inhibition

93.

____________describes the general process of breaking down large molecules into smaller ones.

a)
metabolism
b)
anabolsim
c)
catabolism
d)
dehydration
94.

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.

95.

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

96.

Which statement is true regarding the catabolic pathway?

a)

Molecules are synthesized using dehydration synthesis

b)

Polymers are broken down into their monomeres

c)

Catabolic pathways are used to construct macromolecules such as carbs, lipids and proteins

d)

Catabolic reactions consume energy

97.

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

98.

What happens when enzymes are heated to a high temperature?

a)

The shape of the enzyme are changed and it denatures

b)

The enzymes die

c)

The enzymes' amino acid sequence changes

d)

The enzymes remain the same

99.

Releases energy

a)

endothermic reaction

b)

exothermic reaction

100.

Absorbs energy

a)

endothermic reaction

b)

exothermic reaction

101.

Substances that are changed during a chemical reaction

a)

reactants

b)

products

102.

Slows down reaction

a)

temperature

b)

pH

c)

cataysts

d)

competitive inhibitor

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