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• Proteins are composed of four elements : carbon , hydrogen , oxygen and nitrogen , sometimes they also contains phosphorus and sulfur.
•The monomers of proteins are called amino acids.
• There are 20 kinds of amino acids
• Proteins can be formed from different combinations of 20 amino acids

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Amino acids are classified into two groups:
1.essential: they aren’t synthesized in human body - 8 amino acids obtain from the plants.
2. non-essential: they are synthesized in human body- 12 amino acids.

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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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MEMBERANE PROTEIN- TRANSPORT THE MOLECULES

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MEMBERANE PROTEIN- TRANSPORT THE MOLECULES

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1.  Facilitated diffusion

2. active transport

3. electron transport

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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.

Antibodies have two arms that bind to antigens on bacteria or other payhogens.

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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. Regulate 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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https://ghr.nlm.nih.gov/primer/howgeneswork/protein
https://www.google.com/url?sa=i&source=images&cd=&cad=rja&uact=8&ved=0ahUKEwj_5t209uPfAhUNyqQKHQFeA_UQMwhCKAQwBA&url=https%3A%2F%2Ffood.ndtv.com%2Ffood-drinks%2Fwhy-protein-is-the-most-important-nutrient-your-body-needs-daily-1453639&psig=AOvVaw3xLc7JWPtgjDIeSN07Bm7R&ust=1547234125794431&ictx=3&uact=3
Ted rönesans moodle/ 9.grade biology page
wikipedia.com
https://f1.media.brightcove.com/8/3850378299001/3850378299001_3905210684001_vs-5470e1f8e4b0adab2085fb18-782203291001.jpg?pubId=3850378299001&videoId=3905196728001

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Enzymes are proteins that speed up chemical reactions in the body.