Adenine (A)
Thymine (T)
Guanine (G)
Cytosine (C)
Helicase
Polymerase
Initializing...
Base Pairs Copied
0
Stage
1 / 3
Accuracy
99.9999%
1×
Every time a cell divides, it must copy 3 billion base pairs of DNA. Helicase unwinds the double helix. DNA Polymerase reads each strand and builds a perfect complementary copy. A always pairs with T. G always pairs with C. The result: two identical DNA molecules from one.