The DNA we all share
A’S, T’S, G’S, AND C’S ARE ALL IT TAKES TO MAKE YOU, ME, OR A banana. Unique strings of these molecules, matched up in units called base pairs, form doubled DNA helixes, which serve as the recipes for all living things. Because the challenges of life—such as absorbing nutrients, replicating, and moving—are fairly consistent across organisms, there’s plenty of overlap between sequences. Here’s a sampling.