CHEMISTRY OF LIFE
What does Chemistry have to do with Life Science? There are millions of chemical reactions happening in your body every second. We couldn't live without chemistry. We already learned that are living things are made of cells, but what are cells made of? Atoms are the smallest building block of matter. Atoms combine to form elements (found on periodic table). Elements combine to form molecules, and different kinds of elements combine to make compounds. The six most common elements found in living things are CHNOPS (carbon, hydrogen, nitrogen, oxygen, phosphorus, and sulfur. These elements combine to form 4 macromolecules (meaning "big" molecules): proteins, carbohydrates, lipids (fats), and nucleic acids (DNA and RNA). How do we get the macromolecules we need for our body? We either make them or eat them!