The function of many biologically active molecules requires the presence of carbon-nitrogen ... transforms a molecule by introducing new functional groups into its structure.

Each of these things — along with every other organism on Earth — contains the molecular instructions ... all DNA is composed of the same nitrogen-based molecules. So how does DNA differ ...

Scientists still needed to figure out this molecule's structure to be sure ... biochemist Erwin Chargaff found that the arrangement of nitrogen bases in DNA varied widely, but the amount of ...

Karen is a science journalism intern at The Scientist. Her PhD and post doctoral research was in molecular biology. She has previously written for Science, Creative Nonfiction, and Altasea. View Full ...