As nouns the difference between biosynthesis and aspartokinase

is that biosynthesis is (biochemistry) the synthesis of organic compounds within a living organism, especially the synthesis of large compounds from small ones while aspartokinase is (organic compound) an enzyme that catalyzes the phosphorylation of the amino acid aspartate, the first step in the biosynthesis of three essential amino acids: methionine, lysine, and threonine.