This rotating stick model of an ATP molecule shows its three components: On one end, the 3 phosphate groups, with their purple phosphorus atoms and red oxygen atoms; on the other end, the nitrogenous base adenine, with its blue nitrogen atoms, green carbons, and gray hydrogens; both attached in the middle to a ribose sugar with its green carbon atoms, gray hydrogens, and red oxygens. Credit: Jeff Hardin, University of Wisconsin-Madison Rendering created using PyMol (www.pymol.org)
