Name the 4 classes of marcolecules and give a funtion for each

1. Nucleic Acids - DNA & RNA; molecules that enable living organisms to reproduce genetic information from one generation to the next
2. Carbohydrates - Molecules that provide fuel and build structures in the body
3. Proteins - Molecules that provide structural support, storage, transport, cell communication, movement, and defense
4. Lipids - Molecules that store energy and regulate the body's metabolic processes

Hope that makes sense and helps (:

2. they have negligible mass.