Amino acids has 2 carbons a nitrogen in the amine and a oxygen in its carbonyl group, 2 proteins are polymers of amino acids, 4 proteins have a wide range of functions including antibodies, pH of blood is around neutral 7, 3 a they are called organic substances, carbohyrdates are sugars, 3 easily converted and stored when needed, a NaCl is table salt Na and Cl ions are needed to drive ion pumps inside cells.