Warm-Up. Answer the following questions in complete sentences.

Transcription

1 Warm-Up Answer the following questions in complete sentences. Soap is known to disrupt the lipid bilayer. What effect do you think this would have on the cell? Soap would effect a cell s membrane by

2 Vocabulary Diffusion Facilitate Concentration Gradient

3 Passive Transport

4 Passive Transport The cell membrane takes nutrients in and sends waste out Nutrients Waste

5 Passive Transport The cell membrane takes nutrients in and sends waste out Diffusion = movement WITH the concentration gradient

6 Passive Transport The cell membrane takes nutrients in and sends waste out Diffusion = movement WITH the concentration gradient High concentration Concentration gradient = direction from high concentration to low concentration across a membrane Low concentration

7 Example of diffusion: Air Freshener Describe the movement of the molecules. Sentence Stem: The molecules are moving from to concentration. Predict what would happen if the molecules moved in the opposite direction. Sentence Stem: If the molecules moved in the opposite direction

8 Passive Transport The membrane is made out of phospholipids with hydrophilic heads and hydrophobic tails. Hydrophilic Head Hydrophobic Tails

9 Passive Transport The membrane is made out of phospholipids with hydrophilic heads and hydrophobic tails. Water and large molecules cannot pass through the membrane.

10 Passive Transport The membrane is made out of phospholipids with hydrophilic heads and hydrophobic tails. Water and large molecules cannot pass through the membrane.

11 Passive Transport The membrane is made out of phospholipids with hydrophilic heads and hydrophobic tails. Water and large molecules cannot pass through the membrane. Instead, water and large molecules move through channels in a process called facilitated diffusion.

12 Turn-and-Talk With a partner, answer these two questions: Why is water not able to pass through the middle of the phospholipid bilayer? Water is not able to pass through the middle of the phospholipid bilayer because How does facilitated diffusion help water and large molecules travel across the membrane? Facilitated diffusion helps water and large molecules travel across the membrane by

13 Vocabulary Diffusion Facilitate Concentration Gradient

14 Lipid Cutout Activity Cut out each of the three lipids and the six water (H 2 O) molecules. Label the heads Hydrophilic, Likes Water, and Glycerol, and label the tails Hydrophobic, Does Not Like Water, and Fatty Acid. Color the tails brown and the heads blue. Color the H 2 O molecules blue as well. When ready, paste your lipids and water molecules on the class poster.

15 Lipid Cutout Activity Complete these sentences in your notebook: Lipids are made of tails which DO NOT like water and heads which like water. Lipids are used for - energy storage and.

16 Closure Answer the following question in a complete sentence: Name/Nombre Date/Fecha Period Why does water have to use facilitated diffusion to cross the cell membrane? Suggested sentence stem: Water has to use facilitated diffusion to cross the cell membrane because