Using the hardcopy DNA double helix provided illustrate the four major ways platinum drugs can bond by ligand substitution to DNA bases: G-G 1,2-intrastrandG-A 1,2-intrastrand G-G 1,3-intrastrand G-G interstrand Intrastrand indicates attachments on the same strand, interstrand indicates attachments on different strands. In your answer you may just indicate the bonds to Pt.