Karteikarten
Chemical constituents of living organisms
Karten in diesem Stapel (7)
- 1(INORGANIC) Water1. 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 - 2Inorganic ionsHumans 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 - 3Question TextAnswer Text
- 4Question TextAnswer Text
- 5Lipids•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 - 6Proteins•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 - 7Nucleic 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