To build a simple DNA model, make a double helix shape with beads, their color corresponding to the basic constituents of a DNA molecule: phosphate, sugar and base. Follow the correct order of how the parts of the DNA molecule are connected to each other.Continue Reading
The construction block for the DNA molecule is called a nucleotide. It consists of a sugar molecule, a phosphate group and one of the nucleobases. There are four of these: adenine, abbreviated as A, guanine (G), cytosine (C) and thymine (T). Nucleobases constitute the steps on the spiral ladder, which is the shape of the DNA molecule. Each step is a pair of bases. Guanine only pairs with cytosine, and adenine only with thymine. The sides of the double helix ladder consist of alternating phosphate groups and sugar molecules.