DNA Parenta Parental strand CG strand A Key: TThymine A☐Adenine A c Cytosine G Guanine C#》G Deoxyribose sugar A出 Phosphate Hydrogen bond A G【 Replication fork G G Nucleotide A C》G D#A■ Daughter Parental Daughter strand Parental strand strand forming strand Figure 8.3DNA Figure 8.3