Enzymes. Site-Directed Mutagenesis makes Specific Changes in the Genome. Fusion Proteins Combine Two Functions. Monoclonal Antibodies . Biomolecular Structure Determination. X-ray Crystallography Provides Atomic Structures. NMR Spectroscopy may be Used to Derive Atomic Structures. Electron Microscopy Reveals Molecular Morphology. Atomic Force Microscopy Probes the Surface of Biomolecules. Molecular Modeling. Bionanomachines are Visualized