Translocation Along Microtubules in Insect Ovaries.- A. Introduction.- B. Insect Ovaries, Their Morphology and Development.- C. Translocation of Materials Between Nutritive Cells and Oocytes.- D. Ultrastructure of Nutritive Tubes.- E. Mechanisms of Microtubule-Associated Transport Along Nutritive Tubes.- F. The Motor(s) for Microtubule-Based Translocation.- References.- Nucleo-Cytoplasmic Transport of mRNA: Its Relationship to RNA Metabolism, Subcellular Structures and Other Nucleocytoplasmic Exchanges.- A. Introduction.- B. An Overview of Nucleocytoplasmic Transport.- C. RNA Metabolism and Ribonucleoprotein Structure.- D. Messenger RNA Transport.- E. The Control of Messenger Transport.- F. Conclusions.- References.- Prebiotic Evolution and the Origin of Life: Chemical and Biochemical Aspects.- A. The Object and Its History.- B. Modern Hypotheses, General Objections and Supports.- C. The Oparin Hypothesis and the Simulation Experiments.- D. The Origin of Genetic Information.- E. Conclusions.- References.