Cool Ideas for a 3D Model of DNA

DNA image by chrisharvey from

Deoxyribonucleic acid (DNA) is what makes each of us what we are. Its structure is what is known as a double helix, or a twisted ladder. It's usually represented as half red and half blue, or as having alternating colours within each side of the ladder structure.

DNA and its make-up is often the subject of science fair projects. This structure can be created in 3D using some ordinary household items.

Edible Materials

Creating a DNA model from candy and toothpicks can be a way to represent the building blocks of the human body. After your presentation of the model, you can share the spoils with your guests.

Liquorice is readily available in the colours needed to build a multicoloured DNA structure. The long strips can be cut to size to represent the different sections and will easily attach to each other by poking toothpicks into the ends.

Minimarshmellows can be used in the same fashion. If you cannot find the right colours, you can use food colouring to dye the spongy treat.

Rectangular hard candy can also be used. Slightly melt the hard candy with low heat until it becomes very sticky. Press the ends of the candy lengthwise together to form the strips, and then stick pieces in between sideways to connect the strips.


If you are opting to build a large model, straws offer strength and flexibility. Drinking straws can be slid together to form the twisted ladder. Straws are available in colours, or plain white straws can be spray painted into the needed varieties. Cut the items into the appropriate lengths for the size of your project and use a stapler to attach the centre strips of the DNA. Avoid buying the bendable varieties. These cost more and the flexible area is not usable in the project.

Toothpicks and Glue

The use of toothpicks and glue is an old concept in model building. Toothpicks are available in colours from your local craft store and some grocery outlets. If they are not readily available in the right colours, consider dying or painting them. Choose coloured glue as well. If you cannot find coloured glue, colour your own by stirring in a couple of drops of food colouring in the necessary colours.

Building a model from toothpicks and glue can be time consuming. Holding each toothpick in place until the glue dries is often tiring, but the payoff will be in the recognised effort of the project.