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Unit 3 Test Review - Biochemistry

Total questions: 60

Worksheet time: 58mins

Name
Class
Date
1.

Which macromolecule does this structure represent?

a)

carbohydrate

b)

nucleic acid

c)

protein

d)

lipid

2.

If something has a pH of 13, its would be considered a...

a)

Weak base

b)

Strong base

c)

Weak acid

d)

Strong acid

3.

If something has a pH of 3, it would be considered a...

a)

Weak Base

b)

Strong base

c)

Weak acid

d)

Strong acid

4.

When a human fever raises above 105 degrees Fahrenheit, what happens to the enzymes (proteins) in our bodies?

a)

overloads the enzymes

b)

denatures the enzymes

c)

increase the activation energy

d)

causes molecules to vibrate quickly and not allowing enzymes to attach to substrates

5.

Which macromolecule is pictured?

a)

lipid

b)

carbohydrate

c)

nucleic acid

d)

protein

6.

Which letter represents the active site?

a)

A

b)

B

c)

C

d)

D

7.

What type of bond holds water molecules together?

a)

ionic

b)

covalent

c)

dipole

d)

hydrogen

8.

What does 1 hydrogen (H+) ion and 1 hydroxide (OH-) ion make?

a)

water

b)

table salt

c)

starch

d)

sugar

9.

Why do our bodies need enzymes?

a)

to store excess fat

b)

to turn energy into sugar

c)

to break down the food we eat

d)

to make DNA into nucleic acids

10.
The monomer (building block) of a nucleic acid is
a)
Monosaccharide
b)
Amino Acid
c)
Nucleotide
d)
Polysaccharide
11.
ALL polymers (large molecules) are made up of...
a)
monosaccharides
b)
monomers
c)
proteins
d)
None of these
12.

In the graph, the energy level needs to increase before it goes back down. The increase is called the:

a)

enzyme energy

b)

substrate

c)

activation energy

d)

active site

13.

In the figure, why doesn't the reaction rate continue to increase as the temperature increases?

a)

It does.

b)

It reaches the saturation point where no active site is bonded to the activation energy.

c)

At too high of a temperature, the protein changes shape and can no longer function.

14.

A substrate in an enzyme catalyzed reaction is also called

a)

an active site.

b)

activation energy.

c)

the reactant.

d)

the product.

15.

Letter D...

a)

active site

b)

enzyme

c)

substrate

d)

products

16.
Identify the biomolecule
a)
monosaccharide
b)
disaccharide
c)
polysaccharide
d)
glycogen
17.
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 .
18.
Based on the graph, what is the optimal temperature for this enzyme? 
a)
15oC
b)
40oC
c)
30oC
d)
35oC
19.

The diagram shown is a:

a)

protein

b)

lipid

c)

carbohydrate

d)

nucleic acid

20.

Glucose, a simple sugar and sucrose a complex sugar are examples of:

a)

proteins

b)

carbohydrates

c)

lipids

d)

nucleic acids

21.

A substance formed by a chemical reaction:

a)

substrate

b)

product

c)

enzyme

d)

activation energy

22.

Why is water's property of polarity so important?

a)

The positive and negative poles allow it to attract itself and other stuff

b)

The negative poles of the water molecule allows water to attract itself

c)

The positive and negative poles allow it to repel itself and other stuff

d)

The positive poles of the water molecule allows water to repel itself

23.

A universal solvent:

a)

is slow to heat up and cool down

b)

causes water to stick to other molecules

c)

makes water less dense

d)

can dissolve almost anything

24.

A substance with a pH above 7 is an:

a)

acid

b)

base

c)

neutral

d)

plasma

25.
What is at the center of every atom?
a)
an electron
b)
a compound
c)
a molecule
d)
a nucleus
26.
The positive particles of an atom are 
a)
electrons 
b)
positrons 
c)
neutrons 
d)
protons 
27.
Particles in an atom that are neutral and have no charge are 
a)
negatrons 
b)
electrons 
c)
neutrons 
d)
protons 
28.

The diagram shows the monomer for which macromolecule?

a)

Protein

b)

Lipid

c)

Carbohydrate

d)

Nucleic Acid

29.

An organic compound contains:

a)

Hydrogen

b)

Oxygen

c)

Carbon

d)

Sodium

30.
An element is defined by its number of 
a)
protons
b)
electrons
c)
neutrons
d)
protons + electrons
31.

Isotopes of an element have a different number of...

a)

Protons

b)

Neutrons

c)

Electrons

d)

Mass

32.
In a correctly written symbol what would be located in the "A" position?
a)
number of neutrons
b)
atomic number
c)
number of electrons 
d)
mass number
33.
Isotopes are atoms of the same element that have the same number of __________ but different number of __________ . Therefore, isotopes of the same element have different masses. 
a)
protons, neutrons
b)
protons, electrons
c)
neutrons, protons
d)
electrons, protons
34.

An atom's atomic number is equal to

a)

The number of protons in the atom's nucleus

b)

The number of neutrons in the atom's nucleus

c)

The number of electrons in the atom

d)

The total of protons + neutrons

35.
An element has two naturally occurring isotopes. One is 10.013 amu and is 19.9% abundant. The other is 11.01 amu and is 80.1% abundant. What is the average atomic mass? What element is it?
a)
9.012, Beryllium
b)
12.011, Carbon
c)
6.941, Lithium
d)
10.812, Boron
36.
What do carbon-12 and carbon-14 have in common?
a)
they have same number of protons
b)
they have the same number of neutrons
c)
they have the same atomic mass
d)
they have the same atomic weight
37.
This is a correct dot diagram for oxygen (O)
a)
true
b)
false
38.

What are valence electrons?

a)

The innermost electrons

b)

The outermost electrons

39.

What is the octet rule?

a)

Elements can only have 8 electrons in its outermost shell

b)

The elements must form an octopus like structure

40.

How many valence electrons does Argon have

a)

8

b)

11

41.

Which of the elements in the picture has correct electron dot notation?

a)

1

b)

2

c)

3

d)

4

42.
What is the correct formula for this molecule?
a)
NH
b)
N3H
c)
NH3
d)
NH4
43.
Which of the following is an ionic bond?
a)
H3N
b)
CaCl2
c)
NO2
d)
SCl
44.

How many covalent bonds does carbon need to form in order to have a full octet?

a)

2

b)

3

c)

4

d)

5

45.
Hydrogen needs _____ electrons in its valence shell to be stable.
a)
4
b)
6
c)
8
d)
2
46.
Which solution releases H+ in solution?
a)
Base
b)
Acid
c)
Buffer
d)
Water
47.
This substance releases OH- into solution
a)
Acid
b)
Base
c)
Neutral
48.
According to the pH range which substance is more acidic than lemon juice
a)
Hydrochloric acid
b)
cabbage
c)
milk
49.

TRUE or False

A neutralization reaction occurs when you mix an acid with a base.

a)

TRUE

b)

FALSE

50.

Fill in the blank - A _____________ is a chemical that prevents sharp changes in pH.

a)

acid

b)

enzyme

c)

buffer

d)

base

51.
What 3 letters do enzymes typically end in?
a)
-ose
b)
-ase
c)
-ese
d)
-tic
52.
What is a substance called if it speeds up a chemical reaction?
a)
reusable
b)
catalyst
c)
specific
d)
fragile
53.

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

54.
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.
55.
Every enzyme has a optimal temperature and pH. True or False?
a)
True 
b)
False
56.
Letter C...
a)
active site
b)
enzymes
c)
substrate
d)
products
57.

Humans need to produce the enzyme lactase because:

a)

the disaccharide lactose needs to be broken down to be used for energy.

b)

the disaccharide glucose needs to be broken down to be used for energy.

c)

the polysaccharide galactose needs to be added to fructose to release energy.

d)

the monosaccharide glucose will never be absorbed for energy.

58.
What coefficient should be used to make the following equation balanced?
N2+O2--> _NO 
a)
1
b)
2
c)
3
d)
4
59.

Which equation is balanced?

a)

PbO2 + 2H2

b)

SO2 + H20 --> H2SO4

c)

2Na + 2H2O --> 2NaOH + H2

60.

Determine the coefficients to balance the equation.

__Al +__HCl --> __H2 +__AlCl3

a)

2,6,3,2

b)

it's already balanced

c)

4,12,3,4

d)

2,1,4,5

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