Biochemistry Test Review
Answer Key
B
D
A
C
✗
Too many bonds.
Need to get rid of
one of the
hydrogens.
✓
✓
Not enough
bonds for the
carbons. Need to
add another bond
between them.
δOxygen
Hydrogen
Hydrogen Bond
Covalent Bond
δ+
Cohesion is the attraction of two water molecules to each other. Adhesion is the
attraction of a water molecule to something else.
Dissolves in water. The polar nature of water and the polar nature of the polar
compound would mix, and the water would disrupt the polar bonds of the compound.
Does not dissolve in water. Nonpolar compounds have no charge, and so are repelled
by water. They will not interact, and so nonpolar compound will not dissolve.
Dissolves in water. The charged nature of the ionic compound allows it to mix with
the polar water. The water can then break the bonds of the ionic compound.
The ocean contains many hydrogen bonds which can absorb the heat and eventually
break. Sand, however, does not have hydrogen bonds to absorb the heat and so the
temperature rises more quickly.
Acid
100x
Stomach acid
Base
Blood
Buffers resist change in pH and so help to maintain homeostasis.
They have molecules that can take H+ and OH- ions out of solution. This then
helps to maintain a specific pH.
Proteins
Lipid
Nucleic
Hormones
Saccharides
C
H
COOH
Nucleotides
Fats
Phosphate Group
R
Phospholipid
Sugar
NH2
Base
CH2O
Fatty Acids
Fatty Acids
A
Rings
Glycerol
Chains
C
U
G
T
Phosphate
Group
Saturated
Unsaturated
B
B
A
B
B
A
A
A
B
A
Carbon
True
Polysaccharide
Lipids
Hydrophobic
Phosphate groups
True
Nucleotides
Fold
Multiple
Polysaccharide
Carbohydrate
RNA
Nucleic Acid
Phospholipid
Lipid
Triglyceride
Lipid
J
E
A
F
H
E
J
J
D
B
G
J
C