Composition of Biological Molecules


  • Select one of the following biological molecules and indicate your choice on the signup list.
  • Open MolView 
  • View the molecule in 3D and rotate in space.
  • Turn on the labels to identify the atoms in each molecule
    • Note:  if unable to see labels, follow this color code:  Carbon (black or gray), hydrogen (white), nitrogen (blue), sulfur (yellow), oxygen (red), phosphorus (orange)
  • Record the number of each atom for the molecule in question in the form.  
  • Examine the raw data for the entire class. 
  • Examine the summary data for the entire class. 


  • What can you conclude about the composition of biological molecules?
  • Are there significant differences between the composition of the various classes of biological molecules?  If so, please explain
    • Use pTable and Periodic Table to compare the abundance of elements in humans vs. the ocean, crust and universe. Put your graphs in a collaborative online folder and summarize your findings in the quick write.