Biology 1
- Created by: rachmhw
- Created on: 31-05-16 09:32
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- Biology 1
- 1.1 Nutrients
- Carbohydrate
- provides energy
- found in: sugary foods and starchy foods
- Energy released slowed
- Proteins
- used for growth and repair
- repair body tissues and makes new cells
- muscles, organs and immune system are mainly made of protein
- Vitamins and Minerals
- keep you healthy
- only need tiny amounts
- needed for growth, development and normal function
- Lipids
- fats and oils
- provide energy
- keep you warm
- provide a layer of insulation under your skin
- protect organs from damage
- Water
- needed in all cells and for bodily fluid
- replace lost bodily water
- 70% of our cells is water
- Fibre
- provide bulk to food
- keeps food moving through the gut
- not a nutrient but essential
- provide bulk to food
- Carbohydrate
- 1.2 Food Tests
- Starch
- test with iodine
- orange-yellow liquid
- if it turns blue-black colour
- contains starch
- test with iodine
- Lipids
- test with filter paper
- rub food on paper
- if it goes translucent contains lipids
- rub food on paper
- or test with ethanol
- shake test tube, leave a minute
- pour the ethanol into a test tube of water
- turns cloudy = contains lipids
- pour the ethanol into a test tube of water
- shake test tube, leave a minute
- test with filter paper
- Sugar
- test with Benedict's Solution
- heat test tube with a water bath
- if turns orange-red, it contains sugar
- heat test tube with a water bath
- test with Benedict's Solution
- Protein
- test with copper sulphate and sodium hydroxide
- cpopper sulphate is a pale-blue liquid
- few drops of each solution
- if it turns purple it contains protein
- test with copper sulphate and sodium hydroxide
- Starch
- 1.1 Nutrients
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