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What is an amino acid?
An organic compound that contains both a carboxylic acid functionality (COOH) and an amine functional group (-NH2).
How do amino acids make proteins?
By numerous condensation polymerization reactions; proteins are polymers made of amino acids (monomers).
What are polypeptides?
Also made by condensation polymerization of amino acids, but are shorter than proteins.
One could think about proteins as a product of many polypeptide chains bonded together.
What are carbohydrates?
Organic molecules made of C, H, and O.
They are biologically relevant, e.g. starch and cellulose.
Both of these are polymers made of glucose (other carbohydrate) monomers.
Their structures differ in the way the glucose molecules are joined together.
What is DNA?
Deoxyribonucleic acid - a material that makes up chromosomes - cell structures that store genetic information.
What is the role and structure of DNA?
Made of two polymer chains that are held together in a double helix.
Each polymer chain can be made from 4 different monomers - nucleotides.
Note 
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