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It is used as third source of energy

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Fibrinogen – plasma proteins involve in blood clotting.

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• Example : Keratin – hair, horns, nail , feathers
• Function : repair the tissue.
• Example : collagen , elastin protein – found in the structure of the bone , cartilage.
Function : Tissue streengthening

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Binding site in the membrane for hormones, neurotransmitters, tastes, smell.

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Hemoglobin – transport oxygen, carbondioxide

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It is used in structure of the antibodies which  is synthesized by White blood cells.

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Actin and myosin are needed for muscles.
•actin- myosin: is the protein , find in the structure of the muscle for muscle contraction
•Actin – myosin : find in the structure of the flagellum and cilia for movement of the paremecium , euglane.

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Insulin , FSH, LH
insulin is made up of protein. Regulates the blood glucose level.

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Casein – milk protein
Ferritin - is the protein in the liver, store the iron.

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Enzymes are proteins thatspeed up chemical reactions  in the body.

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FUNCTIONS OF PROTEINS

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proteins -- polypeptides --- dipeptides --- amino acids

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Two amino acids are linked by a covalent bond which is called  peptide bond .
n(amino acid ) -------+ protein + (n-1) water

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-- There are 20 kinds of amino acids .
--Proteins can be formed from different combination of 20 amino acid.

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The monomers of proteins are called amino acids.

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Proteins are composed of four elements :
Carbon , Hydrogen , Oxygen and Nitrogen .
They also contains phosphorus and sulfur .