slide 2.1 lesson 2 special skin cells make melanin body epidermis how is melanin made inside the...

Lesson 2

Slide 2.1

Special Skin Cells Make Melanin

body

epidermis

How is melanin made inside the melanocytes?

QuickTime™ and aTIFF (LZW) decompressor

are needed to see this picture.

epidermis

melanocytes

tissue

cells

Lesson 2

Slide 2.2

QuickTime™ and aTIFF (Uncompressed) decompressor

are needed to see this picture.

QuickTime™ and aTIFF (LZW) decompressor

are needed to see this picture.

QuickTime™ and aTIFF (Uncompressed) decompressor

are needed to see this picture.

Skin Colors Cross Section of Skin Tissue

Melanocyte

Melanin

Lesson 2

Slide 2.3

Looking inside a melanosome

Oxygen

DOPA

Tyrosine

First step in making melanin:Reaction between two molecules, one tyrosine and one O2 to make DOPA

O O

O

Lesson 2

Slide 2.4

Tyrosinase(enzyme)

Skin cell

•

nuc Oxygen

Tyrosine

O O

Lesson 2

Slide 2.5

Tyrosinase(enzyme)

Skin cell

•

nucDOPA

O

Other enzymes turn help turn DOPA into melanin.

Lesson 2

Slide 2.6

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

Lesson 2

Slide 2.7

Cells in Small Intestine Break Down Lactose

intestine cells

How is lactose broken down in intestine cells?

small intestine

Lactose from diet

Lactose brought

into intestine

cells

Lactose broken down

Lesson 2

Slide 2.8

Looking inside small intestine cells

Small intestine cells

lactose

galactose glucose

Lesson 2

Slide 2.9

Looking inside small intestine cells

Small intestine cells

lactoselactase

Lesson 2

Slide 2.10

Looking inside small intestine cells

Small intestine cells

galactose

glucoselactase

Lesson 2

Slide 2.11

Lactase

QuickTime™ and aTIFF (LZW) decompressor

are needed to see this picture.

Lesson 2

Slide 2.12

Protein Structure

Folded chain of amino acids QuickTime™ and a

TIFF (LZW) decompressorare needed to see this picture.

amino acidChain of

amino acids

Whole protein

Lesson 2

Slide 2.13

Protein Models

Cartoon model Space-filling model Toober model

QuickTime™ and aTIFF (LZW) decompressor

are needed to see this picture.QuickTime™ and a

TIFF (LZW) decompressorare needed to see this picture.

Lesson 2

Slide 2.14

QuickTime™ and aTIFF (LZW) decompressor

are needed to see this picture.

Modeling Lactase

QuickTime™ and aTIFF (LZW) decompressor

are needed to see this picture.

Lesson 2

Slide 2.15

Key to Toobers Blue=positive charge (+)

K, R, HRed=negative charge (-)

D, EYellow=hydrophobic

A, V, L, I, P, M, F, WGreen=hydrophilic

G, S, T, N, Q, YWhite = cysteine

C