上游究更大学 2.A Pair of Nucleic Acid Chains with Complementary SHANGHAI JIAO TONG UNIVERSITY Sequences Can Form a Double-Helical Structure DNA的高级结构： DNA双螺旋 0000D0000+ Lear double-stranded DNA molecule Circular DNA molecule DNA a间 核小体 螺线管 我tufe或nn 超螺线管 00nm 向) 700nm W方A/w4mrW 染色体2. A Pair of Nucleic Acid Chains with Complementary Sequences Can Form a Double-Helical Structure DNA的高级结构：