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8.
d-gulose and d-idose
9.
d-allose
10.
O
OH
OH
HO
HO
CH
2
OH
Answers to Chapter 21 Practice Test
1.
a.
NH
3
+
−
O
−
O
CH
2
CH
2
CH
C
O
C
O
d.
NH
3
+
NH
2
+
−
O
CH
2
H N
2
2
CHNH
2
CH CH
C
C
O
b.
NH
3
+
−
O
CH
2
H
3
NCH
+
CH
2 2
CH
2
CH
C
O
e.
NH
3
+
−
O
H
2
2
CH CH
N
C
O
C
O
c.
NH
3
+
−
O
CH
2
CH
3
CH
3
CHCH
C
O
2.
a.
HN NH
CH
2
CH
+
NH
3
+
OH
C
O
c.
N NH
−
CH
2
CH
NH
3
+
O
C
O
b.
HN NH
−
+
CH
2
CH
NH
3
+
O
C
O
d.
N NH
−
CH
2
CH
NH
2
O
C
O
3.
a.
alanine, because it is farther away from its pI
c.
leucine and isoleucine
b.
glycine
d.
aspartic acid