All the DNA in a cell is called a genome. Your body contains trillions of copies of the human genome—one in each of your trillions of cells. A genome contains all the genes that tell the cells how to grow. In fact, all animals, plants, viruses, and bacteria have a genome. However, the genomes' sizes and structures vary among different living creatures.

What: name for all the DNA in a cell
Contains: bases A, T, C, G
Size: about 3 billion bits of information long; contains around 30,000 genes
Characteristics: made of the DNA found in all our
Why important: gives scientists the tools to begin understanding how diseases work and how to prevent them

Image credits: main image: Kelvin Chan.