Dna-rna teaching aid

Claim 1

A model for representing chemical structures, said model including, in combination, units representing substructures, each of said units having a combination of shape, size and color, whereby the units representing different substructures are distinguishable, connecting means for attaching said units, said connecting means permitting relative movement among said units, means supporting the units whereby the model is maintained in a desired shape, said chemical structures including deoxyribonucleic acid, said chemical structure of deoxyribonucleic acid having a combination of units, the combination including units representing substructures gaunine, cytosine, deoxyribose, thymine, phosphate, and adenine, and two strings of units, said strings of units forming a double helix, having a combination of units representing phosphate alternating wiTh the units representing deoxyribose within each of said strings, said strings being removably connected by pairs of units in a runglike fashion within the double helix, said pair of units being of two types, one type having a unit representing substructure cytosine removably connected to a unit representing substructure gaunine, and another type having a unit representing substructure adenine removably connected to a unit representing thymine, said supporting means including a flat annular plate having an aperture located at the center of said plate, a cylindrical rod having an end portion removably secured in said aperture, and having outwardly and then upwardly extending hooks spaced along the length of said rod for supporting said pairs of units, an upper crossmember having an aperture midway along its length, the other end of said rod being secured in the aperture of said crossmember.