Explain why enantiomers can act differently in the body, why racemates may need separation, and how chiral catalysts help make one isomer.
Explain the significance of chirality in the synthetic preparation of drug molecules, including the potential different biological activity of enantiomers, the need to separate racemic mixtures, and the use of chiral catalysts to produce a single pure optical isomer using thalidomide as an example when describing the arrangement of atoms in organic molecules.