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10.
FAD oxidizes dihydrolipoate to lipoate.
11.
HO
+
NH
3
+
CH
2
−
−
O
O
CH
2
CH CH
2
−
O
C
O
C
O
C
O
C
O
12.
In the process of converting uridines to thymidines, tetrahydrofolate is oxidized to dihydrofolate. NADPH
is used to reduce dihydrofolate back to tetrahydrofolate.
13.
a.
Vitamin
B
1
is the only water-insoluble vitamin that has a coenzyme function.
F
b.
FADH
2
is a reducing agent.
T
c.
Thiamine pyrophosphate is vitamin
B
6
.
F
d.
Cofactors that are organic molecules are called coenzymes.
T
e.
Vitamin K is a water-soluble vitamin.
F
f.
Lipoic acid is covalently bound to its enzyme by an amide linkage.
T
Answers to Chapter 24 Practice Test
1.
a.
O
P
RO O
−
O
−
b.
O
P
O O
P
O
−
O
O
−
O
−
C
O
R
c.
O
P
O
−
O
P
O
−
O
O
−
O
−
2.
RCH
2
CH
2
RCH
2
CH
2
CH
2
CH
2
SCoA
C
O
CH SCoA
C
O
C
O
RCH
2
CH
2
CH
H
2
O
RCH
2
CH
2
CH
2
C
O
SCoA
C
O
CH
3
SCoA
C
O
+
CoASH
FAD FADH
2
CH
2
SCoA
RCH
2
CH
2
CH
OH
SCoA
C
O
NAD
+
NADH, H
+