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2. AQA MAINTENANCE OF LIFE - REVISION GUIDE 1. CELLS animals and plants consist of cells. All cells have the following in common: * NUCLEUS - containing chromosomes which carry the genes controlling the cell's characteristics * CELL MEMBRANE - allows movement of substances into and out of the cell. * CYTOPLASM - where chemical reactions take place under the control of enzymes. * MITOCHONDRIA - where respiration takes place (energy is released). 2. DIFFERENCES BETWEEN ANIMAL and PLANT CELLS * CELL WALL - made up of cellulose to give the plant support * CHLOROPLASTS - containing chlorophyll required for photosynthesis * LARGE VACUOLE - containing cell sap (a solution of substances in water for support and storage). 3. PHOTOSYNTHESIS -Photosynthesis describes how green plants make their own food (glucose). They take very simple substances from the environment to do this. Light CARBON DIOXIDE + WATER --> GLUCOSE + OXYGEN Chlorophyll Leaves have chloroplasts containing chlorophyll. Chlorophyll enables the plant...

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