Introduction 
sugar-phosphate 
backbone 
Figure 9. The famous DMA dou- 
ble helix. 
From Alberts, B., Bray, D., 
Lewis, J., Raff, M., Roberts, K., 
and Watson, J. D. 1989. Molecu- 
lar Biology of the Cell, 2nd edi- 
tion. New York: Garland, p. 99. 
minor groove 
major groove 
[y\ DAUGHTER i:)NA DUPLEX 
NEWLY 
SYNTHESIZED 
STRANDS 
OF DNA 
DNA 
POLYMERASE 
DNA POLYMERASE 
UNREPLICATED DNA DUPLEX 
ICXX) NUCLEOTIDES 
Figure 10. An illustration of how DNA is repli- 
cated so as to form two new strands that are 
exactly complementary to the original DNA 
sequences from which they derive their 
sequences. 
From Raven, P.H., and Johnson, G.B. 
1988. Understanding Biology. St. Louis, MO: 
Times Mirror/Mosby College Publishing, 
p. 277. 
DAUGHTER DNA DUPLEX 
