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    Cell Structure Levels of Organisation Cell structures, including the nucleus, cytoplasm, cell membrane, cell wall, chloroplast and vacuole Describe the functions of the nucleus, cytoplasm, cell membrane, cell wall, chloroplast and vacuole Describe the differences between plant and animal cells.

    Biological Molecules The chemical elements present in carbohydrates, proteins and lipids (fats and oils) Describe the structure of carbohydrates, proteins and lipids as large molecules made up from smaller basic units: starch and glycogen from simple sugar; protein from amino acids; lipid from fatty acids and glycerol Describe the tests for glucose and starch The role of enzymes as biological catalysts in metabolic reactions How the functioning of enzymes can be affected by changes in temperature How the functioning of enzymes can be affected by changes in p H Movement of substances into and out of cell Definitions of diffusion, osmosis and active transport The movement of substances into and out of cells can be by diffusion, osmosis and active transport The importance in plants of turgid cells as a means of support The factors that affect the rate of movement of substances into and out of cells to include the effects of surface area to volume ratio, temperature and concentration gradient Nutrition in Flowering Plants Photosynthesis and understand its importance in the conversion of light energy to chemical energy The word equation and the balanced chemical symbol equation for photosynthesis Factors affecting the rate of photosynthesis How the structure of the leaf is adapted for photosynthesis Plants require mineral ions for growth, magnesium ions for chlorophyll and nitrate ions for amino acids Nutrition in Humans A balanced diet should include appropriate proportions of carbohydrate, protein, lipid, vitamins, minerals, water and dietary fibre Sources and functions of carbohydrate, protein, lipid (fats and oils), vitamins A, C and D, and the mineral ions calcium and iron, water and dietary fibre as components of the diet Respiration The process of respiration releases energy in living organisms Describe the differences between aerobic and anaerobic respiration The word equation and the balanced chemical symbol equation for aerobic respiration in living organisms The word equation for anaerobic respiration in plants and in animals Human Respiration Thorax structure Ventilation Alveoli adaptations Biological effects of smoking Transport Diffusion in unicellular organisms Transport systems in multicellular organisms Blood Composition of Blood Role of Plasma Red Blood Cells Phagocytosis Lymphocytes Vaccination Clotting The Heart Describe the structure of the heart and how it functions The heart rate changes during exercise and under the influence of adrenaline Describe the structure of arteries, veins and capillaries and understand their roles The general plan of the circulation system to include the blood vessels to and from the heart, the lungs, the liver and the kidneys.

    We have a collection of videos and experiments that are suitable for the different levels of Biology: Junior Certificate Science, Experiments for Biology, Tests for different Biochemicals, Biology for Key Stage 3, IGCSE Biology, AP Biology and College Biology, AP Biology Labs, Cell Biology, Molecular Biology, and Immunology.

    Microbes Microbes and washing hands Size of Microbes Growth rate of microbes Prevention of infection during operations Microbes sterilization - Control of infection in operating theatre Microbes and spots on your face The following lessons cover some of the topics for the Edexcel IGCSE Biology The Nature and Variety of Living Organism Characteristics of living organism Variety of living organism Pathogens: fungi, bacteria, protoctists or viruses.

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