Cell Membranes 10/8 & 10/10/12

SWBAT infer how molecules move across a cell membrane without energy. Agenda: 1)Warm-up 2)Potato Demo 3)Cell Membrane Diagrams 4)Diffusion Lab 5)Osmosis & Diffusion Output HW: Organize notebook- due Weds. Finish Output pg. 72 Warm-up 10/8 1)If you are in a crowded room, and a door opened to another room, where would you want to go? Why? 2)Which one takes more energy: a fish swimming with the current or into the current? (imagine swimming towards the waves or up a river versus with the waves) 3)Read the Rubric given to you on your way in.

Potato Demonstration One slice has been placed in salty water One slice has been placed in distilled water (contains no extra molecules or minerals) On the top of page 72, write down your predictions of what you think will happen to each slice of potato after about 15 minutes

Diffusion Lab Vocabulary Permeable- will allow things to pass through Hypertonic- “hyper”= more of the substance Hypotonic- “hypo” = less of the substance Selectively permeable- Some things are allowed to pass through

Osmosis and Diffusion Output On pg. 72 draw a picture of a cell that is in a hypotonic solution (such as the iodine solution) and what would happen to the cell if its membrane is semi-permeable to the molecules to the solution Draw a picture of a cell that is in a hypertonic solution and what would happen to the cell (HINT: this should be similar to your drawing of the beaker and baggie, the baggie is like the cell).

SWBAT explain the difference between active and passive transport in cells. Agenda: 1)Warm-up/Review Lab 2)Passive and Active Transport Notes 3)Molecular Movement Activity 4)Review Homework 5)Update Glossary HW: Active Transport Worksheet- Cells Test Next Wednesday Warm-up 10/10 1)What part of the cell membrane is hydrophilic? 2)Which part of the cell membrane is hydrophobic? 3)What happened during the diffusion lab last class? 4)What did the plastic bag represent?

1)What part of the cell membrane is hydrophilic? – The phosphate head 2)Which part of the cell membrane is hydrophobic? – The lipid tail 3)What happened during the diffusion lab last class? – The plastic bag that contained starch was permeable to the iodine in the beaker. 4)What did the plastic bag represent? – A cell membrane

Objective: To compare active and passive transport. Title: Active and Passive Transport Pg. 75; 10/10/12

Different Types of Transport 1)Passive Transport: movement of a substance across a cell membrane that does NOT require energy. (goal to get the concentration the same on both side of membrane) – Allows water, oxygen, CO2, and small molecules to pass through 2)Active Transport: movement of a substance across a cell membrane that DOES require energy – Allows larger or charged molecules to pass through

Passive Transport Type 1: – Diffusion: movement from high concentration to low concentration (any type of small molecule)

Type 2: – Osmosis: refers to the movement of water from high concentration to low concentration.

Type 3: – Facilitated Diffusion: molecules move from an area of higher concentration to lower concentration with the help of carrier proteins

Active Transport Type 1: – Ion Pumps: carrier proteins pump ions and molecules across the membrane; energy required comes from ATP

Type 2: – Bulk movement: large molecules moved across the cell membrane in membrane-bound sacs Exocytosis: wastes and cell products are package by Golgi apparatus into vesicles, which are secreted OUT of the cell Endocytosis: A portion of the cell membrane surrounds macromolecules and form a tiny vesicle, which moves INTO the cell

2 Types of Endocytosis Pinocytosis: movement of liquids INTO the cell Phagocytosis: movement of solids INTO the cell

Types of Transport Passive Transport DiffusionOsmosis Facilitated Diffusion Active Transport Ion Pumps Bulk Movement EndocytosisPinocytosisPhagocytosisExocytosis

Vocabulary- Add ALL to Glossary Passive Transport Active Transport Diffusion Osmosis Facilitated Diffusion Ion Pump Bulk Movement Endocytosis Exocytosis Pinocytosis Phagocytosis

Osmosis and Diffusion Output On pg. 72 draw a picture of a cell that is in a hypotonic solution (such as the iodine solution) and what would happen to the cell if its membrane is semi-permeable to the molecules to the solution Draw a picture of a cell that is in a hypertonic solution and what would happen to the cell (HINT: this should be similar to your drawing of the beaker and baggie, the baggie is like the cell).