Health and Lifestyle Flashcards
What is the role of carbohydrates in the body?
They’re the main source of energy
What is the role of lipids in the body?
Fats and oils provide energy
What is the role of proteins in the body?
Growth and repair of cells and tissues
What is the role of vitamins and minerals in the body?
Essential in small amounts to keep you healthy
What is the role of water in the body?
Needed in all cells and body fluids
What is the role of fibre in the body?
Provides bulk to food to keep it moving through the gut (not actually a nutrient)
What are enzymes?
Enzymes are special proteins that can break large molecules of nutrients down into small molecules
What are enzymes also known as?
Biological catalysts
What does carbohydrase do?
Digests carbohydrates into sugars
What does protease do?
Digest protein into amino acids
What does lipase do?
Digests lipids into fatty acids and glycerol
Where does mechanical digestion take place?
The mouth
How do you test for starch?
Add a few drops of iodine
How do you know if a starch test is positive?
If it turns blue-black
How do you test for sugar?
Add a few drops of benedicts solution and heat in a water bath
How do you know if the sugar test is positive?
If the solution turns orange-red
How do you test for lipids?
Add a few drops of ethanol, shake and leave for one minute. Then poor the ethanol into a test tube of water.
How do you know this the lipids test is positive?
It will turn cloudy
How to test if a food has proteins?
Add a few drops of coppper sulfate solution and sodium hydroxide solution
How to see if a protein test is positive?
If it turns purple
