Chapter 2
This activity contains 2 questions.
Label the diagram of enzyme action.
For each item below, use the pull-down menu to
select the letter that labels the correct part of the
image.
1.1 With
enzyme
1.2 Stable
product
1.3 Without
enzyme
1.4
reactants
Label the following protein structures.
For each item below, use the pull-down menu to
select the letter that labels the correct part of the
image.
2.1
Quarternary
structure
2.2 Primary
structure
2.3 Secondary
structure
2.4 Tertiary
structure
This activity contains 5 questions.
Match each characteristic to the correct bond type:
Using the pull-down menus, match each item in the left column to the corresponding item in
the right column.
1.1 Links partially charged
molecules
Ionic bond
1.2 Links fully charged
molecules
1.3 Unequal sharing of an
electron pair
Nonpolar covalent
bond
Hydrogen bond
Polar covalent
bond
1.4 Equal sharing of an
electron pair
Match each property with the corresponding term:
Using the pull-down menus, match each item in the left column to the corresponding item in
the right column.
2.1 Means "does not associate
well with water"
Hydrophobic
2.2 Particles dispersed in a
medium
Electrolyte
Solvent
2.3 Medium in which particles
are dispersed
Hydrophilic
Solute
2.4 Means "interacts well with
water"
2.5 Dissolves to ions that
conduct current
Match each structural characteristic with the correct protein structure term:
Using the pull-down menus, match each item in the left column to the corresponding item in
the right column.
3.1 Glucose is an example of this
3.2 Formed when two simple sugars
join together
Polysaccharide
Isomers
3.3 Glycogen and starch are examples
of this
Monosaccharide
Disaccharide
3.4 Molecules that have the same
types and numbers of atoms, but
different structures-for example,
glucose and fructose
Match each term with the appropriate definition:
Using the pull-down menus, match each item in the left column to the corresponding item in
the right column.
4.1 Atom
Subatomic particle bearing a positive
charge
Atoms with similar proton numbers but
different neutron numbers
4.2
Proton
Smallest stable units of matter
4.3
Electron
All atoms with the same number of
protons
Uncharged subatomic particle
4.4
Element
Subatomic particle bearing a negative
charge
4.5
Isotope
4.6
Neutron
Match each reaction with its proper type:
Using the pull-down menus, match each item in the left column to the corresponding item in
the right column.
5.1 This lipid is derived from
arachidonic acid
5.2 Cholesterol is an example of this
lipid
Steroid
Phospholipid
5.3 This lipid is an important energy
source, provides insulation, and
protects organs
Eicosanoid
Triglyceride
5.4 This lipid contains a phosphate
group linked to a diglyceride and a
nonlipid group
5.5 This lipid can be saturated or
unsaturated
This activity contains 5 questions.
Fatty acid
ATP is a carbohydrate.
True
False
A compound contains two or more elements.
True
False
A cation is an ion with a negative charge.
True
False
Protons are positively charged particles found in the atomic nucleus.
True
False
Kinetic energy is stored energy.
True
False
This activity contains 5 questions.
ATP is a carbohydrate.
True
False
A compound contains two or more elements.
True
False
A cation is an ion with a negative charge.
True
False
Protons are positively charged particles found in the atomic nucleus.
True
False
Kinetic energy is stored energy.
True
False
This activity contains 25 questions.
The chemical behavior of an atom is determined by
its neutrons.
its mass.
its electrons.
its protons.
How many electrons would carbon have in its outermost shell? (Hint: Carbon has an
atomic number of 6.)
5
6
3
4
If a neutral atom becomes a negative ion, it
gains protons.
loses protons.
gains electrons.
loses electrons.
A bond formed by the sharing of electrons between atoms is called a(n) _________ bond.
ionic
isometric
hydrogen
covalent
An element with an unfilled outermost energy level is called
an ion.
reactive.
inert.
a gas.
A decomposition reaction is
the breakdown of a molecule into smaller components.
the assemblage of smaller molecules into larger molecules.
a chemical reaction that requires the continuous addition of energy to proceed.
the transfer of components from one molecule to another.
What happens to an enzyme that is exposed to extreme temperatures (outside its normal
range)?
It turns the enzyme into a carbohydrate.
It does not affect the enzyme.
It denatures the enzyme.
It catalyzes a reaction faster than before.
Enzymes act by
raising the energy of activation of a chemical reaction.
lowering the energy of activation of a chemical reaction.
making a chemical reaction occur more slowly.
changing the equilibrium point of a chemical reaction.
Which of the following statements about the properties of water is NOT true?
It has a high specific heat.
It freezes at zero degrees Centigrade.
It is a nonpolar molecule.
It dissolves many substances.
What type of protein shape is characterized by the alpha helix or a flat-pleated sheet?
Tertiary structure
Primary structure
Secondary structure
Quaternary structure
The more acidic a solution is,
the more hydrogen ions it has.
the more stable its pH.
the higher its pH.
the more hydroxide ions it has.
Buffers
protect us against parasitic worms.
maintain an almost constant pH.
raise the pH of solutions.
speed up chemical reactions.
Which of the following pH values represents the most acidic solution?
5
2
7
9
A salt is composed of
a sodium compound and a chloride compound.
the parts of any inorganic substance.
covalent bonds.
any cation (except hydrogen) and any anion (except hydroxide).
Acidosis occurs when
blood pH is between 7.35 and 7.45.
blood pH is exactly at 7.8.
blood pH is above 7.45.
blood pH is below 7.35.
What happens when you mix HCl (a strong acid) with NaOH (a strong base)?
They neutralize each other.
They produce an even stronger base.
They create an even stronger acid.
They produce excess salts in the system.
Steroids are important for all the following reasons EXCEPT
they are important in the regulation of tissue metabolism and mineral balance.
they are important in the maintenance of cell membranes.
they are important in insulating and slowing heat loss.
they are involved in the regulation of sexual function.
Glucose is a
polysaccharide.
salt.
disaccharide.
monosaccharide.
Glycogen is a
polysaccharide.
disaccharide.
salt.
monosaccharide.
Which of the following is NOT true about lipids?
They are almost insoluble in water.
They play an important role in forming cell membranes.
They readily dissolve in nonpolar solvents.
They contain less energy per gram than carbohydrates.
A compound consisting of more than 100 amino acids is known as a
protein.
nucleic acid.
carbohydrate.
lipid.
In living organisms, proteins perform which of the following function(s)?
Protect against disease
Transmit information (hormones)
Provide support
All of the above
The primary energy currency of living cells is
ATP.
DNA.
ADP.
cyclic AMP.
Which nucleic acid contains our genetic traits and determines our inherited characteristics?
DNA
RNA
ATP
ADP
Polysaccharides are made up of many monosaccharides, and proteins are made up of
amino acids. What are the units of nucleic acids called?
Glycoproteins
Phospholipids
Nucleotides
Amino acids
This activity contains 6 questions.
Ions that bear a positive charge are called
.
A fatty acid with no double bonds in its carbon chain is
.
A
is structurally related to the glycolipid and are important in the
maintenance of cell membranes.
A
is the bond between the carboxylic acid group of one amino acid and the
amino group of another.
Ions with a negative charge are called
.
A
solution.
protein is compact and generally rounded and readily enters an aqueous