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Lesson 2 Special Skin Cells Make Melanin body tissue epidermis QuickTime™ and a TIFF (LZW) decompressor are needed to see this picture. melanocytes epidermis cells How is melanin made inside the melanocytes? Slide 2.1 Lesson 2 Melanin QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture. Skin Colors QuickTime™ and a TIFF (LZW) decompressor are needed to see this picture. QuickTi me™ and a TIFF (Uncompressed) decompressor are needed to see this picture. Cross Section of Skin Tissue Melanocyte Slide 2.2 Lesson 2 Looking inside a melanosome Tyrosine Oxygen O O DOPA O First step in making melanin: Reaction between two molecules, one tyrosine and one O2 to make DOPA Slide 2.3 Lesson 2 Tyrosinase (enzyme) Tyrosine O O • nuc Oxygen Skin cell Slide 2.4 Lesson 2 Tyrosinase (enzyme) O • nuc DOPA Skin cell Other enzymes turn help turn DOPA Slide 2.5 into melanin. Lesson 2 Lactose intolerance • Cannot break down lactose, a disaccharide found in dairy products • Instead, bacteria in the intestine break down the lactose, producing gas • Most children can break down lactose • Most adults in the world cannot break down lactose - making them lactose intolerant Slide 2.6 Lesson 2 Cells in Small Intestine Break Down Lactose Lactose from diet Lactose brought into intestine cells small intestine intestine cells Lactose broken down How is lactose broken down in intestine cells? Slide 2.7 Lesson 2 Looking inside small intestine cells lactose galactose Small intestine cells glucose Slide 2.8 Lesson 2 Looking inside small intestine cells lactase Small intestine cells lactose Slide 2.9 Lesson 2 Looking inside small intestine cells lactase glucose galactose Small intestine cells Slide 2.10 Lesson 2 Lactase QuickTime™ and a TIFF (LZW) decompressor are needed to see this picture. Slide 2.11 Lesson 2 Protein Structure Chain of amino acids Folded chain of amino acids amino acid QuickTime™ and a TIFF (LZW) decompressor are needed to see this picture. Whole protein Slide 2.12 Lesson 2 Protein Models QuickTime™ and a TIFF (LZW) decompressor are needed to see this picture. Cartoon model Space-filling model QuickTime™ and a TIFF (LZW) decompressor are needed to see this picture. Toober model Slide 2.13 Lesson 2 Modeling Lactase QuickTime™ and a TIFF (LZW) decompressor are needed to see this picture. QuickTime™ and a TIFF (LZW) decompressor are needed to see this picture. Slide 2.14 Lesson 2 Key to Toobers Blue=positive charge (+) K, R, H Red=negative charge (-) D, E Yellow=hydrophobic A, V, L, I, P, M, F, W Green=hydrophilic G, S, T, N, Q, Y White = cysteine C Slide 2.15