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Chapter 6 Test Review

Total questions: 92

Worksheet time: 8hrs 40mins

Name
Class
Date
1.
What is a substance called if it speeds up a chemical reaction?
a)
reusable
b)
catalyst
c)
specific
d)
fragile
2.
Each enzyme only has 1 substrate that will fit its active site.  What is this called?
a)
reusablility
b)
denaturation
c)
specificity
d)
fragility
3.
With what 3 letters do enzymes typically end?
a)
-ose
b)
-ase
c)
-ese
d)
-tic
4.
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.
5.
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 .
6.
Any substance that is acted upon by an enzyme is called a(n)?
a)
Coenzyme
b)
Substrate
c)
Vitamin
d)
Polypeptide
7.
In the diagram, what is letter A? 
a)
product
b)
substrate
c)
enzyme-substrate complex
d)
active site
8.
Enzymes are...
a)
nucleic acids
b)
proteins
c)
lipids
d)
carbohydrates
9.
An enzyme speeds up a chemical reaction in the cell but can only be used once.  True or False? 
a)
true
b)
false
10.
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 
11.
What happens when enzymes are heated to a high temperature?
a)
The enzymes die.
b)
The shapes of the enzyme are altered denature
c)
The enzymes' amino acid sequence changes.
d)
The enzymes remain the same
12.
Which of these is most likely an enzyme?  
a)
Sucrose
b)
Galactose
c)
Fructose
d)
Amylase
13.
Letter D...
a)
active site
b)
enzyme
c)
substrate
d)
products
14.
Letter B...
a)
active site
b)
enzyme
c)
substrate
d)
products
15.
Letter C...
a)
active site
b)
enzymes
c)
substrate
d)
products
16.
Letter E...
a)
active site
b)
enzyme
c)
substrate
d)
products
17.
Which enzyme is most efficient in a basic solution?
a)
A
b)
B
18.
An enzyme speeds up a reaction by
a)
lowering the activation energy.
b)
raising the activation energy.
c)
releasing energy.
d)
absorbing energy.
19.
What is structure A?
a)
Substrate
b)
Active site
c)
Enzyme
d)
Products
20.
What is structure A?
a)
Substrate
b)
Active site
c)
Enzyme
d)
Products
21.
What is structure D?
a)
Substrate
b)
Active site
c)
Enzyme
d)
Products
22.

Which of the following denatures an enzyme?

a)

High Temperatures

b)

Incorrect pH

c)

Both

23.
What is being represented by the letter A in the image?
a)
Substrate
b)
Enzyme
c)
Product
d)
Complex
24.
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. 
25.

Without proper enzyme regulation you would die

a)

true

b)

false

26.

A is the

a)

substrate

b)

enzyme-substrate complex

c)

products

27.

B is the

a)

substrate

b)

enzyme-substrate complex

c)

products

28.

C is the

a)

substrate

b)

enzyme-substrate complex

c)

products

29.

An enzyme ________ the activation energy needed for a reaction to occur.

a)

decreases

b)

increases

c)

does nothing to

d)

increases then decreases

30.

Which color line represent a reaction with an enzyme present?

a)

Blue

b)

Red

c)

Both

d)

Neither

31.

The enzyme and substrates have

a)

adverse shapes

b)

complementary shapes

c)

contrary shapes

d)

similar shapes

32.

The loss of enzyme shape is called

a)

denaturation.

b)

stress.

c)

random movement.

d)

alignment.

33.

After an enzyme is denatured, the substrate can ______ to the active site.

a)

bind

b)

no longer bind

34.

The induced fit model differs to the lock and key model in that...

a)

The induced fit model states that the active site of the enzyme changes shape slight to fit the shape of the substrate

b)

The induced fit model states that the active site of the substrate changes shape slight to fit the shape of the enzyme

c)

The induced fit model states that the allosteric site of the enzyme changes shape slight to fit the shape of the substrate

d)

The induced fit model states that the allosteric site of the substrate changes shape slight to fit the shape of the enzyme

35.

What is the enzyme that aides the reaction shown here?

2H2O2 ➡ 2H2O + O2

a)

Water

b)

Liver

c)

Catalase

d)

Peroxide

e)

Oxygen

36.

The reaction that is shown is an example of...

a)

anabolism

b)

catabolism

37.

The reaction that is shown is an example of...

a)

anabolism

b)

catabolism

38.

The reaction that is shown is an example of...

a)

anabolism

b)

catabolism

39.

The reaction that is shown is an example of...

a)

hydrolysis

b)

dehydration synthesis

40.

The reaction that is shown is an example of...

a)

hydrolysis

b)

dehydration synthesis

41.

Which of the following best explains why cellular respiration is a metabolic pathway?

a)

Water is involved during all of the reactions.

b)

Energy will be released during the reaction.

c)

It starts with reactants and ends with products.

d)

It is a series of reactions (not just one) that are driven by enzymes.

42.

What does the second law of thermodynamics state about disorder?

a)

Every reaction increases the entropy

b)

Every reaction decreases the entropy

43.

Every reaction increases the entropy of the universe…

a)

First law of thermodynamics

b)

Second law of thermodynamics

c)

Third law of thermodynamics

44.

Energy cannot be created or destroyed, but transferred or transformed…

a)

First law of thermodynamics

b)

Second law of thermodynamics

c)

Third law of thermodynamics

45.

What molecule is responsible for powering cellular processes?

a)

ATP

b)

Glucose

c)

Membrane Potential

d)

Sucrose

46.

All of the chemical reactions that occur within a living organism are called?

a)

Anabolic reactions

b)

Metabolism

c)

Catabolic reactions

d)

Energy

47.

Pathways that release energy by breaking down complex molecules into simple molecules are

a)

Catabolic

b)

Metabolic

c)

Anabolic

d)

Hydrolysis

48.

Pathways that consume energy to build complex molecules are

a)

Catabolic

b)

Anabolic

c)

Metabolic

d)

Exergonic

49.

Entropy means a state of order or organization

a)

True

b)

False

50.
Matter can not be created nor destroyed: it can only be
a)
Destroyed a little bit
b)
Invisible
c)
Transformed, changed
d)
None of the above
51.
What is kinetic energy?
a)
energy of work
b)
energy of motion
c)
energy of gravity
d)
energy of power
52.

Potential energy is:

a)

A type of kinetic energy

b)

A fuel

c)

Associated with movement

d)

Stored energy

53.
What kind of energy is in a rock at the edge of a cliff?
a)
Potential
b)
Kinetic
c)
Both potential and kinetic energy
d)
none of the above
54.
Energy due to motion is ____________ energy. 
a)
Potential 
b)
Energy
c)
Kinetic
d)
Friction
55.
Which is the best example that something has kinetic energy?
a)
a. a car parked on a steep hill 
b)
b. a tennis ball rolling across the court
c)
c. a picture hanging on the wall 
d)
d. a piece of coal before it's burned 
56.
The measure of the energy of motion in the particles of matter, which we feel as how hot or cold something is.
a)
matter
b)
gas
c)
temperature
d)
atomic theory
57.
Spontaneous reactions may be extremely slow.
a)
True
b)
False
58.
Entropy increases from solid, liquid to gas. Why?
a)
Molecular disorder increases
b)
Molecular randomness decreases
c)
Molecules are more energetic
d)
Molecules are more reactive
59.

Systems in nature tend to undergo changes toward

a)

lower energy and less disorder

b)

lower energy and more disorder

c)

higher energy and less disorder

d)

higher energy and more disorder

60.

What is a spontaneous process ?

a)

slow process

b)

fast process

c)

process that needs an external intervention to occur

d)

process that does not need external intervention to occur / keep happening

61.

What type of reaction does this free energy diagram show?

a)

Endergonic

b)

Exergonic

62.

What types of reactions are likely shown?

a)

Exergonic

b)

Endergonic

c)

Catabolic

d)

Anabolic

63.

What does Gibbs Free Energy tell us?

a)

How much energy is given off by a reaction.

b)

The tendency of a reaction to become "random"

c)

How spontaneous a reaction is.

64.
Entropy increases from solid, liquid to gas. Why?
a)
Molecular disorder increases
b)
Molecular randomness decreases
c)
Molecules are more energetic
d)
Molecules are more reactive
65.

Which represents a decrease in entropy?

a)

sublimation of CO2

b)

boiling water

c)

condensation of steam on cold glass

d)

NaCl dissolving in water

66.

Which sample has the lowest entropy?

HINT - Look at the phase of each chemical....

a)

1 mole of KNO3(l)

b)

1 mole of KNO3(s)

c)

1 mole of H2O(l)

d)

1 mole of H2O(g)

67.

Which phase change represents a decrease in entropy?

a)

solid to liquid

b)

gas to liquid

c)

liquid to gas

d)

solid to gas

68.

Choose the correct correlation between Gibbs free energy and feasibility.

a)

a reaction to be feasible, ΔG has to be negative.

b)

a reaction to be feasible, ΔG has to be positive.

c)

a reaction to be feasible, ΔG has to be zero

d)

no correlation between ΔG and feasibility

69.
True/False: The rate of a chemical reaction is unrelated to the spontaneity of the reaction.
a)
True
b)
False
70.
Endergonic reactions require:
a)
an input of energy
b)
a release of energy
c)
do not change energy
71.
In which type of reaction is there a positive free energy?
a)
Endergonic
b)
Exergonic
c)
Spontaneous
d)
Synthesis
72.
Heat transfer [blank] occurs from hot to cold. 
a)
always
b)
never
c)
sometimes
d)
rarely
73.
Temperature is a measure of average [blank] energy of individual atoms.
a)
heat
b)
potential
c)
mechanical
d)
kinetic
74.

Systems in nature tend to undergo changes toward

a)

lower energy and less disorder

b)

lower energy and more disorder

c)

higher energy and less disorder

d)

higher energy and more disorder

75.
What is the function of ATP in living things?
a)
provides energy for cells
b)
stores genetic information
c)
provides structure in the nucleus
76.
Which structures shown in the Figure make up the ADP molecule?
a)
A and B
b)
A, B and C
c)
A, B, C, and D
d)
C and D
77.
What does the "TP" in ATP stand for?
a)
2 phosphates
b)
tri (3) phosphates
c)
Two proteins
d)
tri (3) proteins
78.
Which of the following can be compared to a battery in need of recharging?  (empty wallet)
a)
ADP
b)
ATP
c)
Ribose
d)
Adenosine
79.
What are the parts of the ATP molecule?
a)
adenine, thylakoids, stroma
b)
stroma, grana, chlorophyll
c)
adenine, ribose, phosphate groups
d)
NADH, NAHPH, FADH
80.
Which bond of the ATP molecule is broken in order to release energy?
a)
A
b)
B
c)
C
d)
D
81.
Which structures shown in the Figure make up the ATP molecule?
a)
A and B
b)
A, B and C
c)
A, B, C, and D
d)
C and D
82.
Using the figure, which parts of the molecule must the bonds be broken to form an ADP molecule?
a)
A and B
b)
B and C
c)
C and D
d)
all of the above
83.
Which of the following results in the storage of energy in terms of the ATP/ADP cycle?
a)
The breaking of the bond between the 5-carbon sugar and the 1st phosphate group
b)
The addition of a phosphate group
c)
The removal of a phosphate group
d)
The addition of glucose 
84.
Where is the energy stored in ATP molecules
a)
In the Ribose Sugar
b)
In the Adenine group
c)
In the Phosphate bonds
d)
In the Bank
85.
What type of macromolecule is ATP/ADP?
a)
Carbohydrate
b)
Nucleic Acid
c)
Lipid
d)
Protein
86.

Which carbon-based molecule is most commonly broken down to make ATP?

a)

proteins

b)

carbohydrates

c)

lipids

d)

nucleic acids

87.

The allosteric inhibitor of an enzyme

a)

Causes the enzyme to work faster

b)

Binds to the active site

c)

Participates in feedback regulation

d)

Denatures the enzyme

88.

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)

Activation site

d)

Reactant site

89.

How does a noncompetitive inhibitor decrease reaction rates?

a)

Binds to the active site

b)

Binds to the allosteric site

c)

Increases the free energy

d)

Increases the substrate concentration

90.

Describes the process by which an enzyme's function at the active site may be either activated or inhibited by the binding of a regulatory molecule at a separate site.

a)

Allosteric Interactions

b)

Feedback Inhibition

c)

Competitive Inhibition

d)

Noncompetitive Inhibition

91.

Key metabolic enzymes are often inhibited by the end product of the pathway they control.

a)

Competitive inhibition

b)

Non-competitive inhibition

c)

Feedback inhibition

d)

Cofactors

92.

This best describes positive cooperativity of hemoglobin

a)

As 1 O2 binds to a heme group, it causes a sudden shift of polarity, attracting more O2

b)

As 1 O2 binds to a heme group, a conformational change occurs, making it more likely for additional O2 to bind

c)

As 1 O2 binds to a heme group, hemoglobin becomes slightly less hydrophilic

d)

As 1 O2 binds to a globin group, the binding site of O2 within the molecule becomes more exposed

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