Carbohydrates
- molecules composed of carbon, hydrogen and oxygen
 - referred to as sugars
 - C6H12O6
 
Lipids
- molecules composed of carbon, hydrogen and oxygen
 - lipids include steroids, waxes, and fat
 - the enzyme lipase breaks down fats into falty acids and glycerol in the human digestive system
 
Protein
- proteins are composed of amino acidswhich contain carbon, hydrogen, oxygen and nitrogen atoms
 - amino acids also contain sulfur phosphorous, iron and copper
 
Nucleic Acids
- large molecules
 - composed of smaller units called nucleotides
 - live organisms have 2 important nucleic acids DNA or RNA
 
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