Table of Contents 1. Introduction to the Living World, 2. Domain Eukarya: Characteristics and Classification of Fungi, 3. Kingdom Fungi, Phylum Chytridiomycota, 4. Phylum Zygomycota Class Zygomycetes, 5. Phylum Ascomycota, 6. Phylum Basidiomycota, 7. The Anamorphic Fungi (Deutromycetes, Mitosporic fungi, Imperfect fungi, Asexual fungi), 8. Kingdom Straminipila, Class Oomycota, 9. Heterothallism, Heterokaryosis and Parasexual Cycle, 10. Symbiotic Associations of Fungi: Mycorrhizas adn Lichens, 11. Domain Bacteria, 12. Classification of Bacteria, 13. Bacterial Nutrition and Mineral Cycles, 14. Reproduction in Bacteria, 15. Bacterial Diseases of Plants and Human Beings, 16. Domain Archaea (Archaeobacteeria), 17. Viruses-Discovery, Nature, and Biological Status, 18. Structure and Classification of Viruses, 19. Structure of Bacteriophages, Tobacco Mosaic Virus and HIV (AIDS VIrus), 20. The Growth Cycle of Viruses, 21. Viral DIseases of Plants and Human Beings, 22. Viroids and Prions, 23. References, 24. Subject Index