2.7 - 2.9 Biological Molecules

glucose molecules or sub units

what carbs are made of

amino acids

what proteins are made of

glycerol and fatty acids

what lipids are made of

20

number of different types of amino acids

release energy in respiration

why carbs are useful to our bodies

growth and repair

why proteins are useful to our bodies

they are used as an energy store, as insulation and to make cell membranes

why lipids are useful to our bodies

carbon, hydrogen and oxygen

chemical elements which make up carbs

carbon, hydrogen, oxygen, nitrogen and sulfur

chemical elements which make up proteins

carbon, hydrogen and oxygen

chemicals elements which make up lipids

starch

how carbs are stored in plants

glycogen

how is carbs are stored in animals and fungi

long chains

structure of carbs and protien

fat molecules

structure of lipids

iodine

chemical in test for starch

orange/brown

colour of iodine

benedict's solution

chemical in test for glucose

light blue

colour of benedict's solution

biuret's solution

chemical in test for protien

light blue

colour of biuret's solution

ethanol

chemical in test for lipids

colourless

colour of ethanol

dark blue/black

positive test for starch

brick red

positive test for glucose

lilac

positive test for protien

put iodine in food solution

method for testing starch

mix benedict's solution with food solution and heat in water bath @ 80 degrees

method for testing glucose

put biuret's solution in food solution and shake gently

method for testing protien

add ethanol to food solution and shake gently, then add water

method for testing lipids

milky white emulsion should form

positive test for lipids