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Osmosis

bio 211 quiz

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Study tips for Quiz 3 Fluid mosaic membrane model Selective permeability: control what goes in and out of cell Compartmentalization: different processes can be separate Phospholipids-main component of membranes (50% by weight) Structure: hydrophilic heads faces out (water loving) polar surface Hydrophobic tails face in (weather fearing) non-polar region Interior 1972 singer and Garth Fluid- lipids and proteins can move relative to each other within membrane The typical membrane structure consists of a phospholipid bilayer with a number of proteins scattered throughout, along with some carbohydrates (glycoproteins), glycolipids and sterols, similar to the way in which one does a mosaic tile, hence the name. molecules involved in membrane transport Pg 107 fig 5.12

Chapter 7 AP Biology

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Copyright ? 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings PowerPoint? Lecture Presentations for Biology Eighth Edition Neil Campbell and Jane Reece Lectures by Chris Romero, updated by Erin Barley with contributions from Joan Sharp Chapter 7 Membrane Structure and Function Overview: Life at the Edge ? The plasma membrane is the boundary that separates the living cell from its surroundings ? The plasma membrane exhibits selective permeability, allowing some substances to cross it more easily than others Copyright ? 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Fig. 7-1 Concept 7.1: Cellular membranes are fluid mosaics of lipids and proteins ? Phospholipids are the most abundant lipid in the plasma membrane

AP Bio Lab write up #1: osmosis and diffusion

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Diffusion and Osmosis Introduction: Atoms and molecules are constantly in motion. This kinetic energy causes the molecules to bump into each other and move in different directions. This motion is the fuel for diffusion. Diffusion is the random movement of molecules from an area of higher concentration to an area of lower concentration. This will occur until the two areas reach a dynamic equilibrium. When this dynamic equilibrium is reached the concentration of molecules will be approximately equal and there will be no net movement of molecules after this point. The molecules will still be in motion but the concentrations will remain the same.

Egg Mystery Lab - Osmosis

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Raw Egg Mystery Lab Purpose: Conduct an experiment in which you quantitatively and qualitatively demonstrate the effects of materials moving into and out of a semi-permeable membrane, an egg. Materials: 1 egg Balance Water Vinegar Beaker String Corn Syrup Ruler Safety: Wash hands after handling eggs. 2) Eggs are very fragile. Write the following: What will happen to an egg (cell model)placed in the following solutions? (Must be stated in ?If/then? format.) Vinegar Solution: __________________________________________________________________. Water:____________________________________________________________________________. Sugar:____________________________________________________________________________. Procedure: Day 1:

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