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Answers
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4.
The electron-withdrawing protonated amino group causes the carboxyl group of alanine to have
a lower
p
K
a
.
5.
a.
A cigar-shaped protein has a greater percentage of polar residues than a spherical protein.
T
b.
Naturally occurring amino acids have the l-configuration.
T
c.
There is free rotation about a peptide bond.
F
6.
−
CHCH
CH
O
2
CH
2
S S
NH
3
+
NH
3
+
−
O
C
O
C
O
7.
a.
the sequence of the amino acids and the location of the disulfide bonds in the protein
b.
the three-dimensional arrangement of all the atoms in the protein
c.
a description of the way the subunits of an oligomer are arranged in space
8.
–
+
Lys
Ser
Asp
Tyr
Phe
Ile
chromatography
electrophoresis
pH = 5
9.
a.
2.16
+
9.18
2
=
11.34
2
=
5.67
b.
9.04
+
12.48
2
=
21.52
2
=
10.76
10.
Ala Ser Arg Gly Arg Met His Phe Lys Ile
11.
C O
H
CH
3
C NH
H
CH
3
CH
3
CH
+
NH
3
C N
CH
3
CH
+
NH
3
trace
acid
NH
3
HCI
−
C N
HCl, H
2
O
OH
C
O
12.
H
2
O
R SH
Br
−
Br
−
R S Br
R S S R
R S
Br Br
HO
−
−
R S
−
+