1. Respiration and Gas Exchange: Structure of the respiratory system, differences in gas composition between inhaled and exhaled air, and the role of alveoli in oxygen exchange. 2. Plant Biology and Photosynthesis: Impact of tobacco mosaic virus on chloroplasts, effect on plant growth, and methods for investigating photosynthetic rates under varying conditions. 3. Genetics and Inheritance: Role of RNA in viruses, genetic crosses in inheritance of traits, probability calculations for recessive disorders, and methods for selective breeding in animals. 4. Human Circulatory System and Health: Function of blood vessels, risk factors for coronary heart disease, impact of diet and lifestyle on heart disease, and analysis of blood pressure data across different regions. 5. Ecology and Energy Transfer: Food webs, efficiency of energy transfer in trophic levels, biomass pyramids, and factors affecting energy loss in ecosystems. 6. Microbiology and Enzymes: Use of protease enzymes in biological washing powders, recombinant DNA technology for enzyme production, and experimental investigation of enzyme activity at different temperatures.