6- A protein is
A. a polysaccharide.
B. a saturated ester of glycerol.
C. one of the units making up a nucleic acid.
D. a polymer of amino acids.
E. an aromatic hydrocarbon.
13. An amino acid is a compound that contains at least
A.
B.
C.
D.
E.
one amino group and one amide group.
two amino groups and one carboxylic acid group.
one hydroxyl group and one methyl group.
one carboxylic acid group and one amino group.
one methyl group and one amide group.
14. A peptide bond (also called an amide bond) joins two amino acids together. What
atoms are linked by this bond?
A.
B.
C.
D.
E.
C—O
C—H
C—N
N—S
S—C
15. Which one of these elements is not found in proteins?
A.
B.
C.
D.
E.
S
P
C
O
N
16. An essential amino acid is one that
A. must be included in the diet.
B. contains no sulfur.
C. occurs in all types of proteins.
D. is necessary for vitamin production.
E. the body can synthesize.
17. Which one of these choices is the general structural formula of an amino acid?
A.
B.
C.
D.
18. The functional group
found in proteins is called a (an)
A.
B.
C.
D.
E.
amide.
carboxylic acid.
amine.
amino acid.
dipeptide.
19. Which of the structures below corresponds to the dipeptide alanylserine? Note the
following structures:
A.
B.
C.
D.
20. Which of the structures below corresponds to the dipeptide serylalanine? Note the
following structures:
A.
B.
C.
D.
Chapter 25 Synthetic and Natural Organic Polymers
Key
1.E
2.C
3.E
4.C
5.B
6.D
7.D
8.C
9.D
10.A
11.A
12.B
13.D
14.C
15.B
16.A
17.D
18.A
19.B
20.C
21.C
22.B
23.A
24.C
25.E
26.B
27.D
28.C
29.C
30.E
31.D
32.A
33.
34.
35.FALSE
36.TRUE
37.FALSE
38.FALSE
39.TRUE
13. Proteins are polymers of _____.
A) alcohols
B) amino acids
C) esters
D) ethers
14. Proteins are poly _____.
A) esters
B) ethers
C) acids
D) amides
39. Which of the following polymers is not a polyamide?
A) nylon
B) Kevlar
C) polypeptide
D) Teflon
42. Peptide bonds are present in _____.
A) hemoglobin
B) polystyrene
C) Teflon
D) nylon
45. A dipeptide contains _____.
A) two peptides
B) two amino acids
C) two proteins
D) two peptide bonds
53. Which of the following is not a protein?
A) RNA
B) DNA
C) starch
D) none of the above are proteins.
54. The total number of naturally occurring amino acids is _____.
A) 40
B) 20
C) 10
D) 60
55. Polypeptide structures are written conventionally _____.
A) with the amino terminal group on the left
B) with the carboxyl terminal group on the left
C) always starting with alanine
D) always with the alpha helix portion of the chain written first
58. How many tripeptides can be formed containing three different amino acids, A, B and C
?
A) 3
B) 9
C) 12
D) 6
65. The number of peptide bonds present in a hexapeptide is _____.
A) 6
B) 4
C) 5
D) 7
Answer Key
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
39.
40.
41.
42.
43.
44.
B
C
C
C
B
C
C
A
D
C
C
D
B
D
A
C
A
D
B
D
A
B
A
B
C
B
A
C
A
B
C
B
C
A
B
C
A
B
D
C
B
A
D
A
45.
46.
47.
48.
49.
50.
51.
52.
53.
54.
55.
56.
57.
58.
59.
60.
61.
62.
63.
64.
65.
66.
67.
68.
69.
70.
71.
72.
73.
B
C
B
C
C
A
D
B
D
B
A
A
B
D
C
A
B
B
A
D
C
D
B
C
B
A
C
A
C