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  • Proteins are made up of Polypeptides
  • A polypeptide is a chain of amino acids
  • A dipeptide is 2 amino acids bonded/ joined together
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Fibrous proteins are insoluble

Consist of 3 polypeptide chains (have a tertiary structure)

An example of a fibrous protein is Collagen, and Keratin

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Globular Proteins are soluble

Round, compact proteins made up of multiple polypeptide chains. (Quaternary Structure)

Examples of a globular protein would be Haemoglobin, and Insulin.

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  • A sequence of amino acids bonded with peptide bonds


  • Basic level of protein folding
  • Held together together by hydrogen bonds, between carboxyl and amino groups
  • To form Alpha Helices and Beta Pleats


  • Formed by folding whole peptide chain
  • Every protein has unique tertiary structure, responsible for properties and functions
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Amino Acids

An Amine group- NH2

Backbone- N-C-C

Carboxyl Group- C(OH)H

R group- the variable group which has different properties

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