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Cell membrane

AP Biology Chapter 7 questions

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AP Biology Chapter 7

13. Explain how transport proteins are similar to enzymes. The transport proteins of the plasma membrane are similar to enzymes in that they sometimes catalyze one of a number of steps of a metabolic pathway. 14. Explain how transport proteins facilitate diffusion.

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

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CELL OUTLINE I. Cell Defined living structural and functional units enclosed by a membrane arise from existing cells by cell division different types fulfill unique roles that support homeostasis and contribute to the functional capabilities of human organisms the form of the cell follows the function II. Parts of a Cell A. Plasma Membrane - (page 62) form?s the cell?s flexible outer surface, has a permeable barrier that regulates flow of materials in and out of cell. Also plays a key role in communication among cell. (outside layer of cell) i. Phospholipid Bilayer - basic framework of the plasma membrane. - 2 back-to-back layers - 3 types lipid molecules phospholipid 75% cholesterol 20% glycolipid 5% - amphipathic - have both polar and nonpolar parts

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Modified STUDY GUIDE for BIOL 121 for Chapters 5, 6, and 7 with many specific answers included. Spring 2011 Chapter 5 Figures to know: 1 -5, 8, 9, 11, 13, and 15. 5.1 Review phospholipids (p 41) and “phospholipid bilayer” membrane (p 58). Use fig 5.1 to describe how all cell membranes are described as a “fluid mosaic”. Fluid Mosaic: The phospholipids and proteins together are not a solid wall, but a very flexible structure. The word “mosaic” means that the proteins are interspersed among the phospholipid molecules. The phospholipids are by far the most abundant molecules in the membrane and form the “flexible barrier”. List and describe the 6 basic types of functions that membrane proteins have:

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