4.10.4. 2. WAYS of DEPICTING DNA STRUCTURE

4.10.4. 3. Complementary DNA Strands

• The two DNA strands are complementary strands
• The sequence of bases on one automatically determines the sequence of bases on the other strand.
• The chains run antiparallel
• Only when the 2 strands are antiparallel can the base pairs form the H bonds that hold them together.