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3.
a.
O R
ʹ
O
2
3
O R
O
O
P
NH
O
O O
+
–
b.
R OR
ʹ
R and R
ʹ
are long, straight chains.
O
C
4.
a.
Cholesterol is the precursor of all other steroids.
T
b.
The double bonds in unsaturated fats are conjugated.
F
c.
Fats have a higher percentage of saturated fatty acids than do oils.
T
d.
A saturated fatty acid has a lower melting point than an unsaturated fatty acid with the same
number of carbons.
F
e.
Lipids are insoluble in water.
T
f.
A diterpene contains 20 carbons.
T
g.
Vitamin A is not a coenzyme.
T
5.
30
6.
5-membered ring
7.
arachidonic acid
Answers to Chapter 26 Practice Test
1.
dUMP
2.
5
—A—T—G—C—A—A—G—T—
3
3.
A
4.
a.
Guanine and cytosine are purines.
F
b.
The
3
-OH group allows RNA to be easily cleaved.
F
c.
The number of As in DNA is equal to the number of Ts.
T
d.
rRNA carries the amino acid that will be incorporated into a protein.
F
e.
The template strand of DNA is the one transcribed to form RNA.
T
f.
The
5
-end of DNA has a free OH group.
F
g.
The synthesis of proteins from an RNA blueprint is called transcription.
F
h.
A nucleotide consists of a base and a sugar.
F
i.
RNA contains Ts, and DNA contains Us.
F
5.
only #1
6.
5
—G—C—A—U—G—G—A—C—C—C—C—G—U—
3
7.
CA and TG