DNA The Cell s Life Pattern

Description: , two interwoven, twisted strands, shown here in gray, are held together by cross-linkages, shown in red, to form a spiral ladder-the double helix. The diagram shows first that each strand is composed of alternating deoxyribose sugar, shown in orange, and phosphate molecules, represented in purple. Attached to each sugar are molecules called bases, of which there are only four types found in DNA (here designated as red, blue, green or yellow). The pairing of specific bases (red with yellow, ...