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B2 : Organisation (Food tests (Starch - iodine turns to blue/black, Sugar …
B2 : Organisation
Food tests
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Lipids - add ethanol, dissolve in water, white precipitate
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Plant Diagram
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Xylem = transport water and minerals from roots to stem and leaves. Hollow tubes for transpiration stream.
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Enzymes are biological catalysts, they speed up reactions but don't get used up.
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Enzymes have an active site, shaped for a specific substrate. The substrate binds to the active site and gets broken into two separate products.
Cancer
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Malignant tumours are cancerous, they invade neighbouring tissues. Travel in bloodstream and form secondary tumour.
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Types of tissue : muscular, glandular and epithelial.
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Veins = carry blood to heart, thin walls, large lumen, low pressure, have valves
Artery = carry blood from heart, thick walls, small lumen, high pressure
Capillaries = one cell thick, low pressure, gas exchange happens