1. Biology 101A Unit 3A Day 6: Active transport

2. Before class starts… Make sure that you turn in your case study from yesterday Open notebook to Unit Assignment sheet so we can update

3. Getting started 9-13 Compare/contrast isotonic, hypotonic, and hypertonic solutions.

4. What is a concentration gradient? When molecules move across a membrane with help from transport proteins in the membrane Move down the concentration gradient No expenditure of energy Comparison of number of molecules Passive diffusion moves molecules DOWN the concentration gradient from high to low concentrations

5. What is meant by active transport? Cells must use energy to move molecules into/out of the cell Goes against the concentration gradient Cells must use energy to move molecules into/out of the cell Goes against the concentration gradient Move from low to high concentrations Cell must expend energy

6. What are some examples of active transport? Exocytosis: when materials are moved out of the cell Endocytosis: when materials are moved into the cell Types of endo: Phagocytosis: cellular eating Pinocytosis: cellular drinkingdrinking

7. Todays Assignments Osmosis Inquiry lab- finish up with your table group After that- pick up your Osmosis review from front table Group 1: Enrichment review Group 2: Osmosis practical problems Group 3: Cells & Tonicity flipbook

8. Quick Quiz 1.Movement of water from high to low concentrations is called? a. diffusion b. active transport c. osmosis 2. The plasma membrane is referred to as ? a. semi-permeable b. permeable c. impermeable 3. What type of diffusion requires help, but doesnt use energy? a. passive b. active c. facilitated 4. Diffusion moves molecules ___ the concentration gradient. a. up b. down c. into equilibrium with 5.Pinocytosis is a form of ? a. Endocytosis b. exocytosis c. phagocytosis