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Simple proteins:-

Structure: They consist of only amino acids

Examples: Albumin, which is found in blood plasma, leaves and seeds of plants

conjugated proteins:-

Structure: They consist of amino acids associated with other elements.

Examples:-

1- Nuclear-associated proteins:

2- Phosphoproteins: They contain phosphorus element (ex. Casein – milk protein)

3- Thyroxin: Hormone secreted by thyroid gland and contains iodine element.

4- Blood hemoglobin: Its protein contains iron element