948
APPENDIX D
A Closer Look at DNA and RNA Structures
FIGURE D.1
The nucleotides of a double-stranded DNA molecule pair so that an adenine (A) of one strand hydrogen bonds to a
thymine (T) of the other strand, and a guanine (G) of one strand hydrogen bonds to a cytosine (C) of the other. The dotted lines represent
hydrogen bonds.
CH
2
OH
C
H
2
C
H
2
C
H
2
C
H
2
O
O
O
O
P
O
O
O
CH
2
O
CH
2
O
CH
2
O
O
O
P
O
O
O
O
O
P
O
O
O
P
O
O
O
O
P
O
O
O
O
P
O
O
O
O
P
O
O
O
O
P
OH
O
O
O
2
P
P
O
H
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
O
O
O
O
O
G
G
A
C
C
T
O
N
N
N
N
N
N
H
H
H
H
H
O
O
AT
CH
3
CH
3
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