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Description
Flashcards by sathitakiangsri, updated more than 1 year ago
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Created by sathitakiangsri
over 8 years ago
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| Question | Answer |
| (INORGANIC) Water | 1. As a reactant ~take part in some chemical reactions ~reactant in photosynthesis ~reactants in the breakdown of complex food substances during digestion 2. Medium for chemical reactions ~ good solvent ~ dissolve many substances ~ in cells, provide aqueous medium for chemical reactions 3. Medium of transport ~substance dissolve in water and are arrived around the body ~blood contains 90% water ~dissolved inorganic ions in water carried through roots 4. Cooling agent ~removed hear through evaporation ~sweat mainly consists of water, evaporation of sweat cools down the body ~plant lose water through transpiration, prevents overheating 5. Provides support ~soft bodied animals have fluid filled cavity in body. The hydrostatic pressure built up in the body cavity provides support ~plants become turgid when filled with water ~provides buoyancy for aquatic animals and plants |
| Inorganic ions | Humans need various inorganic ions to keep healthy. 1. Nitrate ~the source of nitrogen in plants for the synthesis of proteins 2. Magnesium ~component of chlorophyll ~activates some enzymes for regulating some metabolic reaction 3. Calcium ~main components of teeth and bones ~required in process like muscle contraction, blood clotting and send messages to the nervous system ~strengthen cell wall 4. Iron ~component of haemoglobin which is an oxygen carrying pigment in the red blood cell ~activates some enzymes |
| Question Text | Answer Text |
| Question Text | Answer Text |
| Lipids | •carbon, hydrogen and oxygen •hydrogen to oxygen ratio is much greater than carbohydrates •main types of lipids are: -phospholipids ~ main component of cell membrane -triglycerides ~ fats and oil. ~energy reserve ~reduce heat loss ~protect internal organs |
| Proteins | •carbon, hydrogen, oxygen, nitrogen and in some sulphur •make many of the body tissues e.g. Hair, muscle, skin •enzymes are made of protein •antibodies are made of protein |
| Nucleic acid | •carbon, hydrogen, oxygen, nitrogen, phosphorus •2 types of Nucleic acid: -deoxyribonucleic acid (DNA) ~ contains genetic information which helps to determine the organisms features and control all cell activities. -ribonucleic acid (RNA) ~ synthesizes protein |
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