Proteins

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

Fibrous proteins are insoluble

Consist of 3 polypeptide chains (have a tertiary structure)

An example of a fibrous protein is Collagen, and Keratin

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.

Primary-  

• A sequence of amino acids bonded with peptide bonds

Secondary-

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

Tertiary-

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

An Amine group- NH2

Backbone- N-C-C

Carboxyl Group- C(OH)H

R group- the variable group which has different properties