3.3 the chemistry of food Flashcards
(23 cards)
What are carbohydrates made up of?
Units of sugar
What are simple sugars?
Carbohydrates that contain only one or two sugar units
What do simple sugars do to Benedict solution?
They turn blue Benedict solution brick red on heating
What do you complex carbohydrates contain?
They contain long chains of simple sugar units bonded together
What does starch do to iodine?
It turns yellow – red iodine solution blue – black
What molecules do lipids consist of?
Fatty acid bonded to a molecule of glycerin
What does the ethanol test indicate?
The presence of lipids in solutions
What are protein molecule is made up of?
Long chains of amino acid
What does protein do to Biuret Reagent?
Protein turns it from blue to purple
What are carbohydrates?
They are molecules that contain only carbon, hydrogen, and oxygen.
What foods are carbohydrates found in?
Rice, potatoes, and bread
What do carbohydrates provide energy for?
Metabolism
What are simple sugars?
Small carbohydrate units, for example glucose
What are lipids?
Includes fats and oils
What foods are lipids found in?
Butter, olive oil, and crisps
What are lipids made of?
Carbon, hydrogen, and oxygen
What are fatty acids?
Part of the structure of a lipid molecule
What is glycerol?
Part of the structure of a lipid molecule
What’s a proteins?
Molecules that contain carbon, hydrogen, and oxygen, and nitrogen
What’s a protein made of?
Long chains of amino acids
What are proteins used for?
They are used for building the cells and tissues of the body and to form enzymes
What are amino acids?
They are building blocks of proteins
What are amino acids made of?
Hydrogen, oxygen, and nitrogen
