and
erence
f
f
di
The
between
CYTOSINE C
H
H
H
C
C
N
C
N
H
C CYTOSINE
H
H
C
C
C
H
C N
C N
N
H
N H
H
ADENINE A
N
C
N
H
N
C N
C
C
C N
H
H
C
OPO
O
CH2
O
O
C
CH
N
C
H
REPLACES THYMINE IN RNA
NITROGEN
OUS
BASES
2
HC
HC
0
A
N
R
RIBON
CID
A
C
I
E
L
UC
e
s
o
b
i
R ar
sug
O
N H
H
P
S
P
3
C
O
T
HC
N
CH
C
C
H
N
N H
N
C
A
N
C
CH
C
N
N
N H
O
N
H N
O
H
G
C
N
H
DNA
IBONUC
C
LEIC AC
ID
Deoxyri
bose
sugar
N
C
1
C CH
H2
O
CH
HC
O
CH C
H
2
2
CH
O
O P
O
H
C
H
C
C
0
C
N
N
C
H
0
H
CH
O
O
H
H
O P O
N
T THYMINE
C
N
C
CH
O
C
H
H
C
DEOXYR
O
O P
O
H
C
HC
C
H
O
O
O
H
C
O
N
CH
H
S
CH
CH
CH C
H2
HC
H
N
C N
N C
C
C
C
N
N
Sugar (S )
Phosphate (P )
P
2
O
O P
C
C N
N
S
O
O P
O
0
N
S
O
HC
C
P
P S
S
H
C N
A ADENINE
P
URACIL U
C
H
H
Hydrogen
bonds
H
H
MASSEY.AC.NZ
N
C
SUGAR
PHOSPHATE
BACKBONE
H
C
O
NITROGENOUS BASES
GUANINE G
C
O
G GUANINE
BASE PAIR
O
N
C
C
H
N
O
N
N
H
C
H
N
Replaces Uracil in DNA
S
U
O
N
E
G
O
NITR
BASES