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• Two pieces of red licorice (Twizzler®)
• Four toothpicks
• Two mini pink marshmallows
• Two mini yellow marshmallows
• Two mini orange marshmallows
• Two mini green marshmallows
• Index card
To demonstrate how chemical bases are paired in DNA
There are four chemical bases in DNA: Adenine (A), Cytosine (C), Guanine (G), and Thymine (T). Adenine (A) always pairs with Thymine (T) and Cytosine (C) always pairs with Guanine (G). Use the index card to write the following key: Adenine (A)= green, Thymine (T)= pink, Cytosine (C)=yellow, and Guanine (G)=orange.
Put one pink marshmallow on one of the toothpicks. Next, put one yellow marshmallow on another toothpick. Repeat these steps with the additional toothpicks and green and orange marshmallows. Now each toothpick has a different color of marshmallow on it.
DNA stands for deoxyribonucleic acid. It holds a code for every cell in the body. DNA looks like a twisted ladder when it is isolated from a cell. The sides of the DNA ladder are called the backbone and the rungs of the ladder are pairs of small chemicals referred to as bases. DNA is the “instruction manual” for the cells in living organisms. There are more than 200 cell types in the body and DNA tells each cell type what job to do. DNA stays very busy managing all of these cells!