Proteins

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Proteins

  1. 1. Start-Up: Which one is a carbohydrate? Which is a lipid? How can you tell?
  2. 2. Proteins serve many purposes: Purpose Example 1. Form structures keratin (hair, nails)‏ 2. Provide support control cell shape 3. Provide defense white-blood cells 4. Receive & send messages insulin 5. Transport substances hemoglobin 6. Speed up reactions enzymes
  3. 3. But what exactly is a Protein? A protein is a polymer made up of monomers called amino acids There are 20 different amino acids They all have this basic structure, but differ in the side group (R)‏
  4. 4. The 9 Hydrophilic Amino Acids (only R groups are shown)‏
  5. 5. The 11 Hydrophobic Amino Acids (only R groups are shown)‏
  6. 6. A chain of amino acids is called a polypeptide
  7. 7. Amino acids are linked together by a dehydration reaction
  8. 8. Proteins differ by the arrangement of the 20 possible amino acids If you have a small polypeptide with only 4 0f the 20 possible amino acids you could make: 20 x 20 x 20 x 20 = 160,000 possible proteins!!! This is one example of the unity and diversity of life
  9. 9. For a protein to work properly it must be folded or twisted into an exact shape The shape of the protein determines its function (or job)‏ It is very important for a protein to maintain its shape in order to correctly perform its job
  10. 10. Structure determines function!

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