Biological molecules Flashcards
Elements in carbohydrates
carbon, hydrogen, oxygen
Function of carbohydrates
Source of energy
Monomer carbohydrate
glucose
Polymer carbohydrate
starch
Example of carbohydrate
sugar
Elements of proteins
carbon, hydrogen, oxygen, nitrogen
Function of proteins
Growth –> repairing cells
Monomer protein
amino acid
Polymer protein
polypeptide chain
Example of protein
haemoglobin
Elements of lipids
carbon, hydrogen, oxygen
Function of lipids
protection, energy storage, cell membrane
Composition of lipids
3 fatty acids + 1 glycerol
Example of lipid
oil
Structure of carbohydrates
large molecules made up of small simple sugars
Structure of proteins
large molecules made up of amino acids
What test is iodine used for?
carbohydrates
What is the colour of iodine when the molecule is present?
blue/black
What is the colour of iodine when the molecule isn’t present?
brown/orange
What test is Benedict’s solution used for?
glucose
What is the colour of Benedict’s solution when the molecule is present?
orange/red
What is the colour of Benedict’s solution when the molecule isn’t present?
blue
What test is the Biuret reagent used for?
proteins
What is the colour of the Biuret reagent when the molecule is present?
purple
