Proteins (CIE IGCSE Chemistry)
Revision Note
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AlexandraExpertise
Chemistry
Proteins
Extended
- Proteins are condensation polymers which are formed from amino acid monomers joined together by amide links (in proteins also known as a peptide link) similar to the structure in nylon
- The units in proteins are different however, consisting of amino acids
- Amino acids are small molecules containing NH2 and COOH functional groups
General structure of an amino acid
- There are twenty common amino acids, each differing by their side chain, represented by R
- Proteins can contain between 60 and 600 of these amino acids in different orders
- These are the monomers which polymerise to form the protein
Diagram showing condensation polymerisation to produce a protein
- The structure of proteins can be represented using the following diagram whereby the boxes represent the carbon chains
Diagram showing a section of protein
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