Biological Molecules Flashcards
What do carbohydrate molecules contain
Carbon, hydrogen, oxygen
Give two large, complex molecules and what they are made up of
Starch and glycogen, made up of smaller molecules (eg glucose or maltose) joined together in a long chain
What are proteins made up of
Long chains of amino acids
What do proteins contain
Carbon, nitrogen, hydrogen and oxygen
What are lipids made up of
Fatty acids and glycerol
What do lipids contain
Carbon, hydrogen and oxygen
How can you test for glucose in a sample
Add Benedicts reagent to a sample and heat it. Make sure the solution doesn’t boil. If the test is positive it will form a coloured precipitate (it will turn from blue to brick red)
What is a precipitate
Solid particles suspended in the solution
How do you test for starch
Add iodine solution to the test sample. If starch is present the sample changes from browny-orange to a dark, blue-black colour.
What are carbohydrates made up of
Simple sugars
