Contents: Introduction. 1. Signal Transduction Elements. 2. Molecular Developments. 3. Genetic Enhancement. 4. Obtaining Natural Drugs. 5. Agricultural Biotechnology. 6. Recombinant DNA Technology. 7. Transcriptional Factors. 8. Molecular Biology and Genetic Engineering. 9. Transgenic Crop. 10. Transformed Tomato Plant. 11. Localization of Transgenic in Plant Chromosomes. 12. Analysis of Gene Expression. 13. Resistance to Plant Viruses. 14. Proteomics Analysis. 15. Plant Proteomics and Glycosylatia. 16. Insecticides.