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Unit 2 Biomolecule Practice Questions

Total questions: 81

Worksheet time: 2hrs 56mins

Name
Class
Date
1.

Protein that speeds up a biological reaction by lowering the activation energy needed to start the reaction.

a)

Substrate

b)

Enzyme

c)

Amino acid

d)

Lipid

2.

Carbon compound joined by peptide bonds; building blocks of protein

a)

Amino acid

b)

Carbohydrate

c)

Lipid

d)

Enzyme

3.

What does organic mean (in science)?

a)

It costs more at the grocery store

b)

It contains carbon

c)

It is made of many individual parts

d)

It produces energy

4.

What is a function of lipids?

a)

To provide short term energy to living organisms

b)

The provide the structure in muscles

c)

To provide long term storage of energy

d)

Storing your genetic information

5.

What is the function of proteins?

a)

They are used for cell to cell communication

b)

They insulate the body, are used for short term energy and are found in glycogen

c)

They are used as the structural components of the body (muscles and organs)

d)

They create the cell membrane

6.

Which of the following is a carbohydrate?

a)

DNA

b)

Protein

c)

Sugars

d)

Fats

7.
Which biomolecule is this a picture of?
a)
Protein
b)
Nucleic Acid
c)
Lipid
d)
Carbohydrate
8.
Which biomolecule is this a picture of?
a)
Protein
b)
Nucleic Acid
c)
Lipid
d)
Carbohydrate
9.
Which biomolecule is responsible for insulation and LONG term energy storage?
a)
Proteins
b)
Nucleic Acids
c)
Lipids
d)
Carbohydrates
10.
The monomer (building block) of a nucleic acid is
a)
Monosaccharide
b)
Amino Acid
c)
Nucleotide
d)
Polysaccharide
11.
Which 2 molecules contains the elements C-H-O and function pertains to energy?
a)
Lipids and Protein
b)
Carbohydrates and Nucleic Acids
c)
Protein and Carbohydrates
d)
Carbohydrates and Lipids
12.
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 
13.
Any substance that is acted upon by an enzyme is called a(n)?
a)
Coenzyme
b)
Substrate
c)
Vitamin
d)
Polypeptide
14.
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. 
15.
Based on the graph, what temperature does this enzyme work best? 
a)
15 C
b)
40 C
c)
30 C
d)
47 C
16.
Letter C...
a)
active site
b)
enzymes
c)
substrate
d)
products
17.
Letter D...
a)
active site
b)
enzyme
c)
substrate
d)
products
18.

Which of the following is an example of COHESION?

a)

water sticking to water

b)

water sticking to glass

c)

oil sticking to plastic

d)

hydrogen sticking to oxygen

19.

Water is polar. What does that mean?

a)

it is a molecule with a negatively charged side and a positively charged side

b)

it is a molecule with no charge

c)

it is a molecule with identical charges on opposite ends

d)

it is a molecule with too many protons

20.

Why does ice float?

a)

water expands when it freezes, making ice less dense than water

b)

water compacts when it freezes, making ice more dense than water

c)

hydrogen bonds in water push the ice to the surface

d)

ice is afraid of water, and avoids it

21.
Which of the following is LEAST likely to dissolve in water?
a)
nonpolar fats and oils
b)
polar sugar molecules
c)
salt made of a positive sodium ion and a negative chloride ion
d)
all of the substances will dissolve easily in water
22.

Large bodies of water, such as lakes and oceans, do not quickly fluctuate in temperature. What is the reason for this phenomenon?

a)

Water is an acid.

b)

Water is a versatile solvent.

c)

Water has a high specific heat.

d)

Water acts as a buffer.

23.
A(n) ______ is a substance with a pH less than 7
a)
Acid
b)
Alkaline
c)
Base
d)
Buffer
24.
A(n) _______ is a substance with a pH greater than 7.
a)
Base
b)
Acid
c)
Buffer
d)
Water
25.
The particles that are found in the nucleus of an atom are _____.
a)
Neutrons and electrons
b)
Electrons only
c)
Protons and neutrons
d)
Protons and electrons
26.
Where are electrons of an atom found?
a)
Nucleus
b)
Electron Cloud
c)
Some are in the nucleus and some in the electron cloud.
d)
They are moving everywhere.
27.
What are the 3 particles that make-up the atom?
a)
Protons, neutrons, and isotopes
b)
Neutrons, isotopes, and electrons
c)
Positives, negatives, and electrons
d)
Protons, neutrons, and electrons
28.

How are covalent bonds formed?

a)

Sharing of electrons

b)

Giving or taking of electrons

c)

Sharing of protons and neutrons

d)

None of the above

29.

What elements make up a protein?

a)

C, H, O

b)

C, H, O, N

c)

C, H, O, N, P

d)

L, M, N, O, P

30.

Which item listed below is the strongest ACID?

a)

acid rain

b)

pure water

c)

ammonia

d)

hydrochloric acid

31.

The following figure is illustrating

a)

Dehydration Synthesis

b)

Hydrolysis

c)

Nuclear Fusion

d)

Biomolecular Splicing

32.
Enzymes are capable of increasing the rate of a chemical reaction within a living cell.  Enzymes accomplish this through which of the following means?
a)
reducing the number of products   
b)
reducing the activation energy
c)
increasing the temperature of the cell
d)
increasing the concentration of reactants 
33.
An enzyme speeds up a reaction by
a)
lowering the activation energy.
b)
raising the activation energy.
c)
releasing energy.
d)
absorbing energy.
34.
Which biomolecule is found in fats, oils, and waxes and is a source of long-term energy? 
a)
Proteins
b)
Nucleic Acid
c)
Lipids
d)
Carbohydrate
35.
Which organic molecule is paired with its function?
a)
nucleic acid : to store energy
b)
proteins : to provide insulation
c)
lipids : to regulate metabolic 
d)
carbohydrate : to provide quick–release energy
36.
Why are enzymes considered reusable?
a)
Enzymes are constantly renewed
b)
Enzymes are made of unusually strong materials.
c)
Enzymes are constantly regenerated by respiration.
d)
Enzymes are not changed when they catalyze a chemical reaction.
37.

Many monomers can be bonded together to form ______________.

a)

atoms

b)

plastic material

c)

polymers

d)

cells

38.

The structure pictured is the building block or monomer of a(n):

a)

carbohydrate

b)

nucleic acid

c)

protein

d)

lipid

39.

Water striders can walk across the surface of calm water. Their feet push the surface of the water down slightly, but they do not break the surface. Why?

a)

The insects are light enough so they do not break the hydrogen bonds holding the water molecules together

b)

The insects actually use their wings to hover slightly above the water’s surface and they only skim it with their feet.

c)

The insect’s feet are non-polar, so they are repelled by the polar water molecules and are pushed away from the water’s surface.

d)

The insects are small enough to see the individual water molecules, so they are able to step carefully from one molecule to the next

40.

Capillary action is best described as:

a)

The property of water that allows ice to float on the surface of liquid water

b)

The property of water that allows it to dissolve polar substances

c)

When water molecules stick to other surfaces

d)

The property of water that allows water to move up a thin tube (or the stem of a plant) by itself

41.

Which of the following does NOT describe a polymer?

a)

polymers are made of monomers.

b)

polymers are large molecules.

c)

polymers usually form by covalent bonding.

d)

polymers are broken down by the process of hydrogenation.

42.
Which biomolecule is important source of energy for humans; glucose for human cells, tissues, and organs; provides fiber, sugar, and starches; provides structural support, cell wall, and cell membrane maker?
a)
Nucleic Acid
b)
Lipid
c)
Carbohydrate
d)
Protein
43.

This biomolecule is made up of amino acids held together by peptide bonds and includes the elements C,H,O,N:

a)

carbohydrate

b)

lipid

c)

protein

d)

nucleic acid

44.

Which organic molecules is paired with its function?

a)

nucleic acid- to store energy

b)

lipids – to regulate metabolic.

c)

protein- to provide insulation.

d)

carbohydrates – to provide quick-release energy.

45.
Carbon, Hydrogen, Oxygen and Nitrogen are elements in what biomolecule?
a)
Carbohydrate
b)
Lipid
c)
Protein
d)
Nucleic acid
46.
Which biomolecule helps form muscles?
a)
Nucleic Acid
b)
Carbohydrate
c)
Protein
d)
Lipids
47.

How are the functions of a carbohydrate and a lipid similar?

a)

Both are a source of energy.

b)

Both are replicated during meiosis.

c)

Both lower the activation energy of reactions.

d)

Both dissolve nutrients in the digestive system.

48.

Which organic molecule would a long-distance runner most likely choose to eat two hours before a race?

a)

A protein, because it builds muscle mass.

b)

A lipid because it provides long term energy storage.

c)

A carbohydrate because it releases energy quickly.

d)

A protein, because it transports oxygen into the blood stream.

49.
What do monomers do?
a)
Bond to make a polymer
b)
Create essential proteins
c)
Stores energy
d)
Splits to make more cells
50.
The monomer of a protein is called...
a)
an amino acid
b)
a monosaccharide
c)
a fatty acid
d)
a nucleotide
51.
Which biomolecule contains fats, oils, and waxes?
a)
Proteins
b)
Nucleic Acid
c)
Lipids
d)
Carbohydrate
52.

Which biomolecule contains phosphorous?

a)

Carbohydrates

b)

Lipids

c)

Proteins

d)

Nucleic Acids

53.

When water rises up a thin straw or moves up a tree from the roots to the leaves, it is called _____________.

a)

Capillary Action

b)

Surface Tension

c)

Heat of Vaporization

d)

Density of Water

54.

What makes water a universal solvent?

a)

It is a polar molecule that can form hydrogen bonds, allowing it to dissolve many substances.

b)

It is a nonpolar molecule that can form hydrogen bonds, allowing it to dissolve many substances.

c)

It is a polar molecule with a low specific heat, allowing it to dissolve many substances.

d)

It is a nonpolar molecule with a low specific heat, allowing it to dissolve many substances.

55.

What property allows water molecules to stick to each other to form drops?

a)

Cohesion

b)

Adhesion

c)

Surface Tension

d)

Capillary Action

56.

When it rains, water will stick to your clothes and get them wet. What property is this an example of?

a)

Cohesion

b)

Adhesion

c)

High Specific Heat Capacity

d)

Surface Tension

57.
Which two particles make up the nucleus of an atom?
a)
Protons and Electrons
b)
Protons and Neutrons
c)
Molecules and Compounds
d)
Neutrons and Electrons
58.
The pH scale is a range from:
a)
1-7
b)
0-14
c)
1-14
d)
1-20
59.
According to the pH range which substance is more acidic than lemon juice
a)
Hydrochloric acid
b)
cabbage
c)
milk
60.

A combination of particles of one or more substance that are distributed uniformly throughout another substance is a/an

a)

Mixture

b)

Substance

c)

Solution

61.

Which is the stronger acid?

a)

pH 1

b)

pH 4

c)

pH 8

d)

pH 13

62.
Which of the following is LEAST likely to dissolve in water?
a)
nonpolar fats and oils
b)
polar sugar molecules
c)
salt made of a positive sodium ion and a negative chloride ion
d)
all of the substances will dissolve easily in water
63.
Large bodies of water, such as lakes and oceans, do not quickly fluctuate in temperature. What is the reason for this phenomenon?
a)
Water is an acid.
b)
Water is a versatile solvent.
c)
Water has a high heat capacity.
d)
 Water acts as a buffer.
64.
The fact that ice floats on liquid water is due to the fact that water's solid is ___________ than it's liquid form
a)
less polar
b)
more polar
c)
less dense
d)
more dense
65.
The tightness across the surface of water that enables paper clips to float is ____________.
a)
adhesion
b)
capillary action
c)
surface tension
d)
polarity
66.
Which statement explains why water molecules stick together?
a)
both sides are negative
b)
one side has a positive charge and the other side has a negative charge
c)
one side has a negative charge adn the other side has a neutral charge
d)
both sides are positive
67.

Identify the macromolecule in the picture

* cholesterol and triglycerides

a)

lipid

b)

protein

c)

nucleic acid

d)

carbohydrate

68.
What type of macromolecule is being represented in this image? 
a)
carbohydrate
b)
lipid
c)
protein
d)
nucleic acid
69.

The most important element that is the backbone of all biological molecules

a)
carbon
b)
nitrogen
c)
phosphorus
d)
sulfur
70.
What is the activation energy?
a)
The energy of the products
b)
The energy of the reactants
c)
The minimum energy needed by the reactants to form the products.
d)
The energy lost in the reaction
71.

How does a catalyst work in speeding up a reaction?

a)

By lowering the activation energy or reaction

b)

by giving them more energy

c)

by making them more available

72.

Label the diagram using vocab words. Number 1

a)

Substrate

b)

Enzyme

c)

Active Site

73.

Label Number 2

a)

Substrate

b)

Enzyme

c)

Active Site

74.

Label number 3

a)

Substrate

b)

Enzyme

c)

Active Site

75.

A substance that initiates or speeds up a chemical reaction and is not permanently changed in the process.

a)

Hydrolysis

b)

Coenzyme

c)

Catalyst

d)

activation energy

76.

The blue water represents the

a)

solvent

b)

solute

77.
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. 
78.
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.
79.
Lipids are made of... 
a)
C H O
b)
C H O N
c)
C H O N P
d)
C H O N S
80.

This macromolecule carries hereditary information and instructions for building molecules

a)

carbohydrate

b)

lipids

c)

protein

d)

nucleic acid

81.

Plants build cellulose (a polysaccharide) to makeup their parts like leaves, roots, stems, etc. What monomer do plants use to build cellulose?

a)

monosaccharides

b)

disaccharides

c)

amino acids

d)

nucleotides

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