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Chemical Reaction & Enzyme Review with Application

Total questions: 45

Worksheet time: 43mins

Name
Class
Date
1.
What is the energy needed to start an chemical reaction referred to?
a)
Beginning Energy
b)
Potential Energy 
c)
Kinetic Energy
d)
Activation energy
2.
What is the best description of an enzyme?
a)
energy needed to get a reaction started
b)
large compound formed from combinations of many monomers
c)
proteins that act as biological catalyst
d)
an organic compound
3.
What is a cataylst?
a)
A substance that speeds up a rate of chemical reaction.
b)
Molecules that make enzymes work harder and faster 
c)
The reaction of an enzyme
d)
A substance that slows down a rate of chemical reaction.
4.
What is a substrate?
a)
What speeds up the enzyme substrate process
b)
What the reactants are called when an enzyme is involved
c)
Proteins that act as biological catalyst
d)
What slows down the enzyme substrate process
5.
Enzymes are usually....
a)
Protiens
b)
Lipids
c)
Carbohydrates
d)
Nucleic acids
6.
What can denature an enzyme?
a)
Poisons/toxins
b)
Extreme temperatures
c)
Changes in pH 
d)
All of these listed
7.
What is the primary role of enzymes inside of living cells? 
a)
organizing the translation of proteins
b)
allowing cells to be motile
c)
absorbing ultraviolet rays
d)
speeding up chemical reactions 
8.
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
9.
Which of the following statements suggests that the shape of an enzyme determines the enzyme’s function?
 
a)
Enzymes active sites are specific to a substrate.
b)
Enzymes can operate in a wide range of conditions.
c)
Enzymes are activated by neighboring molecules.
d)
 Enzymes can be found in all life-forms. 
10.
Which of these is most likely an enzyme?  (Based on the suffix)
a)
Sucrose
b)
Saccharide
c)
Fructose
d)
Amylase
11.
The name of reactants that fits into the active site of an enzyme is called a(n) ____.
a)
proteases
b)
nucleic acids
c)
catalases
d)
substrates
12.

Which is NOT true?

a)

Enzymes speed up chemical reactions

b)

Enzymes react best at a specific temperature

c)

Enzymes only control ONE type of reaction

d)

Enzymes are made of lipids

13.
Where do substrates specifically bind on an enzyme?
a)
cells
b)
surface receptor
c)
protein channel
d)
active site
14.
What 3 letters do enzymes typically end in?
a)
-ose
b)
-ase
c)
-ese
d)
-tic
15.
After the enzyme and substrate bind together and perform the reaction, what does the substrate become?
a)
the substrate(s)
b)
the enzyme(s)
c)
the product(s)
d)
the active site(s)
16.
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
17.

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.

18.

Which of these enzymes breaks down the sugar (lactose) in milk?

a)

Catalase

b)

Lactase

c)

Fructose

d)

Amylase

19.
Each enzyme only has only 1 substrate that will fit its active site.  What is this called?
a)
reusablility
b)
denaturation
c)
specificity
d)
fragility
20.
The current model of enzyme action between the substrate and the active site is referred to as the...
a)
Induced Fit Model
b)
Lock & Key Model
c)
Biogenesis Model
d)
Chemosynthesis Model
21.

Any substance that is acted upon by an enzyme is called a(n)?

a)

Product

b)

Substrate

c)

Active site

d)

Reactant

22.
A lock and key is sometimes used as an analogy to promote understanding of enzymes. Which characteristic of enzymes or their action is best illustrated by this explain?
a)
The sensitivity of enzymes to changes in pH
b)
The change in activation energy the enzymes cause
c)
The specificity of fit between an enzyme and a substrate
d)
The increase in reaction rate due to the action of the enzyme
23.
Why does enzyme activity decrease when it is in solution that has either a too high or too low pH?
a)
All enzymes only work in neutral solutions
b)
Enzyme activity remains unchanged in different pH's
c)
The shape of the active site changes
d)
The shape of the substrate changes
24.
An enzyme speeds up a chemical reaction in the cell, but can only be used once? 
a)
True
b)
False
25.

What is the optimum pH of the enzyme pepsin (found in the stomach gastric acid of humans)

a)

5

b)

2

c)

7

d)

9

26.
Babies do not have well developed digestive systems for breaking down proteins; therefore baby food is prepared after treatment with which enzyme? 
a)
protease
b)
lipase
c)
carbohydrase
d)
synthase
27.
In chemical reactions, what happens to the energy in a bond when a bond is broken?
a)
Energy is created
b)
Energy is destroyed
c)
Energy is released
d)
Energy is captured
28.
In chemical reactions, what happens to the energy in the bonds formed in the new products?
a)
Energy is created
b)
Energy is destroyed
c)
Energy is released
d)
Energy is captured
29.
Catalysts can include motion, heat, pH changes as well as enzymes.
a)
True
b)
False
30.

What is the sum of all of the chemical reactions that occur within an organism referred to?

a)

Enzymes

b)

Kinetic Energy

c)

Metabolism

d)

Activation Energy

31.

The building up of complex substances from smaller reactants by enzymes are known as _________________ reactions.

a)

catabolic

b)

anabolic

c)

endergonic

d)

exogonic

32.

The break down of complex substances into smaller products by enzymes are known as _________________ reactions.

a)

endothermic

b)

exothermic

c)

anabolic

d)

catabolic

33.

Surrounding temperature gets warmer with an _______________ reaction.

a)

endothermic

b)

exothermic

34.

Surrounding temperature gets colder with an __________ reaction

a)

Endothermic

b)

Exothermic

35.
What type of reaction occurs in a hand warmer
a)
exothermic
b)
endothermic
36.

A general term for a chemical reaction that absorbs energy is _____________

a)

endergonic reaction

b)

exogonic reaction

c)

endothermic reaction

d)

exothermic reaction

37.

A general term for a chemical reaction that releases some form of energy is

a)

exergonic reaction

b)

exothermic reaction

c)

endergonic reaction

d)

endothermic reaction

38.

chemical reaction in which energy is primarily given off in the form of heat

a)

exothermic reaction

b)

exergonic reaction

c)

endothermic reaction

d)

endergonic reaction

39.

in a chemical reaction, the new substance that is formed

a)

product

b)

reactant

c)

substrate

d)

enzyme

40.
Choose the pair of terms that correctly completes this sentence: Catabolism is to anabolism as _____ is to _____.
a)
exergonic; endergonic
b)
free energy; entropy
c)
work; energy
d)
entropy; enthalpy
41.

In chemical reactions, the energy that is released or stored is found in the ____________.

a)

equation

b)

neutrons

c)

elements

d)

bonds

42.

When a chemical bond is broken, energy is ____________, but when a bond is created, energy is _________________.

a)

stored, released

b)

released, stored

c)

created, destroyed

d)

destroyed, created

43.

True or False: All enzymes are catalysts.

a)

True

b)

False

44.

True or False: All endothermic reactions are exergonic.

a)

True

b)

False

45.

True or False: In chemical reactions, enzymes are considered a substrate.

a)

True

b)

False

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