Affordable, easy-to-understand replica of the "molecule of life." At last - a realistic DNA model that fits within your budget! Your students will construct their own double helix model complete with cytosine, adenine, guanine and thymine nucleic acid bases; connecting phosphate strands; and a center rod representing hydrogren bonds. Easy-to-assemble, three-dimensional model is made of durable plastic components for years of classroom use. Color-coded parts feature specially shaped ends to ensure proper base pair alignment and can be unzipped to demonstrate DNA replication. Includes comprehensive, illustrated student and teacher guides. Includes sturdy, metal base for easy rotation and classroom display. Size: 19"H x 7 1/2"D.