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IGCSE Biology - Nutrition
Flash Cards about Nutrition
20
Biology
9th Grade
05/13/2010

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Term
Nutrition
Definition
Taking in nutrients, through absorbing and assimilating them, and using them for growth and tissue repair.
Term
Carbohydrates are made up of what basic unit?
Definition
Monosaccharides (simple sugars, e.g. glucose) and Polysaccharides (chains of monosaccharides, e.g. starch) make up what food type?
Term
Lipids are made up of what basic unit?
Definition
Three fatty acids with one glycerol molecule make up what food type?
Term
Proteins are made up ofwhat basic unit?
Definition
Long chains of sub-units called amino acids make up what food type?
Term
Carbohydrates and Lipids are made of what chemical elements?
Definition
Just Carbon (C), Hydrogen (H) and Oxygen (O) make up which two food types?
Term
Proteins are made of what chemical elements?
Definition
Carbon (C), Hydrogen (H), Oxygen (O), Nitrogen (N) and Sulpher (S) make up which two food types?
Term
Test for starch...
Definition
Iodine solution. Positive result is blue/black. Which food type are you testing for?
Term
Test for reducing suagars (Glucose)...
Definition
Benedict's reagent. Heat in a boiling water bath for 2-3 minutes. Positive result is orange/brick-red. Which food type are you testing for?
Term
Test for protein...
Definition
Biuret Reagent. Positive result is mauve/purple. What food type are you testing for?
Term
Test for fats...
Definition
Ethanol. Positive result is milky-white emulsion. What food type are you testing for?
Term
Carbohydrates
Definition
Main energy source for living cells. Should make up 5/7 of the diet.
Term
Proteins
Definition
Uses: catalysts, transport molecules, structural material, hormones, defence against disease. long chains of amino acids. Should make up 1/7 of our diet.
Term
Lipids
Definition
Include fats and oils. An energy source and good for insulation!!! Should make up 1/7 of our diet. Made up of glycerol and fatty acids.
Term
Vitamins and Minerals
Definition
They are needed in small amounts. Essential to help the body use other nutrients efficiently.
Term
Vitamin C
Definition
A water-soluable vitamin found in green leafy vegetables, and citrus fruits (e.g. Spinach and Oranges). Defincy in it may cause scurvy. It is essential for the formation of connective tissues.
Term
Vitamin D
Definition
Fat-Soluble vitamin found in fish liver oils and in milk. Can be made by the body if exposed to sunlight. Needed for the efficient uptake and use of calcium ions. A deficiency may cause rickets.
Term
Iron (mineral)
Definition
Required for the sysnthesis of haemoglobin. Found in red meat especially liver. A deficiency may cause anemia (fatigue and weakness).
Term
Calcium (mineral)
Definition
Forms part of the structure of bones and teeth. Found in diary products, and fish. Deficiency may result in rickets.
Term
Water
Definition
Forms 70% of human body. 1.5 litres of it is lost per day, so this must be replaced. A loss of 5% of it could lead to unconciousness. A loss of 10% of it could be fatal.
Term
Fibre (Rouhgage)
Definition
Indigestable part of food. Deficiency may result in constipation.
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