949
APPENDIX D
FIGURE D.3
The ribonucleotides contain adenine, uracil, cytosine, or guanine.
FIGURE D.2
The deoxyribonucleotides contain adenine, thymine, cytosine, or guanine.
Adenine
NH
2
H
3
CH
O
H
Thymine
O
H
C
CN
H
C
N
C
C
NH
C
C
C
N
C
N
C
H
N
H
Guanine
O
H
H
Cytosine
NH
2
H
C
CN
C
N
C
C
O
NN
C
C
CH
N
C
N
H
C
H
N
H
Adenine
NH
2
H
O
H
H
Uracil
O
H
C
CN
H
N
C
N
C
C
NH
C
C
C
N
C
N
C
H
N
H
Guanine
O
H
H
Cytosine
NH
2
H
C
CN
C
N
C
C
O
NN
C
C
CH
N
C
N
H
C
H
N
H
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