Cell Transport Vocabulary Chapter 7, Section 3 Solution Solute Concentration Diffusion Equilibrium Osmosis Isotonic Hypertonic Hypotonic Osmotic pressure Protein channels Facilitated diffusion Active transport Endocytosis Phagocytosis Pinocytosis Exocytosis

A: Orange B. Orange C. Yellow D. Black E. Gray F. none G: Red H: Light blue I: Brown J: Pink K: Blue L: Green M: Pink N: Black O: Green P: Purple Q: none

Plant cell coloring: A: light green K: yellow B: dark green L: red C: yellow M: brown D,D1: light blue N: black E: dark blue O: pink F. green P: blue G: gray Q: none H: orange R: light purple I: red S: dark purple J: black

Cell Boundaries Chapter 7 – Section 3

Cell Membrane Found in all cells 2 jobs Shows selective permeability by deciding what can enter/leave cell Provides protection and support

Composition Lipid bilayer Protein channels are embedded in lipid bilayer; allow large particles to move in/out of cell

Cell Wall Found in all plants, bacteria, fungi and some protists Job is to provide support and protection for cell

Composition Plant cell wall is made of cellulose Fungus cell wall is made of chitin Some protists have one made of cellulose Some bacteria have one made of peptidoglycan

Diffusion particles move from high concentration to low concentration Does NOT require energy – passive transport Movement continues until equilibrium is reached (p. 184 – figure 7-14)

Osmosis Movement of WATER across cell membrane Cell membrane is selectively permeable – it allows certain materials in/out

Types of Solutions Isotonic – concentration of water and solute is same on both sides of membrane; equilibrium has been reached Hypertonic – more water inside cell than out; water will leave cell, trying to dilute the solution on outside. Cell will shrink/die

Hypotonic – more water outside cell than in; water will enter cell, trying to dilute the solution. Cell will swell and possibly burst

Plasmolysis Occurs in plant cells when large vacuole loses water Plant wilts due to loss of turgor pressure Intake of water refills vacuole

Facilitated Diffusion Facilitate – Means “to help” molecules (like glucose) are too large to diffuse across membrane Use PROTEIN CHANNELS in lipid bilayer to move in/out Still passive transport, no energy required P. 187- figure 7-17

Active Transport Energy IS required for large molecules to move in Moving from low to high concentration Against the concentration gradient 2 types

Endocytosis – cell engulfs substance; forms vacuole around it; can be either by: Phagocytosis – take food into the cell Pinocytosis – take in water

Exocytosis

IAN pages 13, 14, and 15 (page 186 in textbook) PAGE 13 TITLE: Isotonic Define, draw animal and plant cell PAGE 14 TITLE: Hypertonic PAGE 15 TITLE: Hypotonic