1. Organic Macromolecules
Large (macro) molecules that are found in all living organisms
Organic – any molecule that has carbon atoms AND hydrogen atoms  
4 major classes:
1. Carbohydrates Lipids
3. Proteins Nucleic Acids
Usually large molecules made of many atoms
Examples of Organic Macromolecules:
- DNA (Nucleic Acid) Oils (Fats)
- Glucose (a sugar= Carbohydrate) Enzymes (Proteins)

2. Inorganic Molecules
Any molecule that is NOT carbon based with hydrogen atoms
It may contain carbon OR hydrogen, but NOT C and H together.
Some other elements found in inorganic molecules include:
- Nitrogen (N) Sulfur (S)
- Oxygen (O) Chlorine (Cl)
- Potassium (K) Sodium (Na)
Examples of Inorganic Molecules:
 - Water (H2O) Ammonia (NH3)
- Nitrogen Gas (N2) Carbon Dioxide (CO2)