Section 24.1
Proteins
Practice Test
1.
A chain of 15 amino acids joined by peptide bonds is called a(n) __________.
a.
enzyme
b.
peptide
c.
polypeptide
d.
protein
Hint
2.
What is the name given to a series of amino acids that are linked by peptide bonds?
a.
protein
b.
lipid
c.
carbohydrate
d.
ester
Hint
3.
What two functional groups are contained in all amino acids?
a.
carbonyl and halogen
b.
carboxyl and amino
c.
amido and ether
d.
amino and amido
Hint
4.
What type of chemical functional group is made when a peptide bond is formed?
a.
amine
b.
ester
c.
amide
d.
carbonyl
Hint
5.
A polypeptide of 50 or more amino acids is called a protein. What kind of molecule is the polypeptide?
a.
isomer
b.
monomer
c.
stereomer
d.
polymer
Hint
6.
How many different amino acids are commonly found in living things?
a.
20
b.
10
c.
15
d.
30
Hint
7.
Proteins can form two three-dimensional structures. Changes in temperature, pH, and other factors will disrupt these structures. By what name do we know this disruption?
a.
denaturation
b.
helix
c.
sheet
d.
polypeptide
Hint
8.
Most enzymes are ____________.
a.
lipids
b.
carbohydrates
c.
proteins
d.
denatured
Hint
9.
Enzymes act as __________ in your body.
a.
catalysts
b.
carbohydrates
c.
lipids
d.
substrates
Hint
10.
To function properly, the reactive site of an enzyme must have the same shape as the substrate to which it binds. This fit is commonly known as _____________.
a.
tongue and groove
b.
lock and key
c.
projection and enclosure
d.
heme and globin
Hint
11.
What are the four primary functions and uses of proteins in living cells?
a.
energy storage, digestion, denaturation, transport
b.
recycling, digestion, polymerization, transport
c.
catalysis, structure, transport, carrying signals
d.
denaturation, structure, transport, carrying signals
Hint
