An engaging, simple manipulative set for studying DNA, including structure, replication, and transcription. This wonderfully flexible set allows students to build and learn using models that demonstrate phosphate groups, deoxyribose and ribose sugars, hydrogen bonds, 4 codons, and nucleotides. It includes 521 K'NEX® rods and connectors, providing materials for a group of 2 to 3 students working together to build a 12-base pair parent molecule and then replicate it to create two 12-base pair daughter molecules. Students can also create the mRNA for each strand in the parent molecule. Set features a 20-page, full-color student booklet and a CD-ROM with a teacher's guide that includes lesson plans and background information covering DNA structure, replication, transcription, coding, translation, and mutation. Packed in a strong, stackable storage case with movable dividers and a transparent, lockable lid.