In AP® Biology, students have been studying organic molecules, specifically the four classes of biological molecules  —the macromolecules— carbohydrates, lipid, proteins and nucleic acids. Molecules in each class will have specific features and structures particular to that class of molecule. Being able to recognize the structures, their similarities and their differences which will influence the structure and function of these molecules, is an important skill to have prior to examining these structures and their functions in living things.

We invite you to watch the video below, where students were given cards with the structural diagrams of 45 unidentified macromolecules which they sorted according to their structure, then determined what specific properties they may have, dependent on what elements are included in the macromolecules or how the atoms are arranged.