Designed to aid in teaching the structure and function of the nucleic acid molecules that make up DNA (deoxyribonucleic acids) and RNA (ribonucleic acids). The Teacher's Guide provides lessons designed to take students through three instructional modules: First is DNA Structure, Second is Replication and Transcription and third is Coding, Translation and Mutations. Set includes 521 K'NEX parts enough to build 19 DNA and RNA models up to two at a time. Supports 2 - 3 students working as a team. Packaged in a strong storage tray with snap-on lid. Includes building instructions and comprehensive teacher's guide, aligned to national Science, Technology, Engineering and Maths standards including Key Stage 3, 4 & 5.