Biology 1107 Chapter 6 Notes
Biology 1107 Chapter 6 Notes Bio 1107, 02
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This 3 page Class Notes was uploaded by Ashlyn Parsons on Friday September 16, 2016. The Class Notes belongs to Bio 1107, 02 at University of West Georgia taught by Micheal Arterburn in Fall 2016. Since its upload, it has received 7 views. For similar materials see Principles of Biology in Biology at University of West Georgia.
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Date Created: 09/16/16
Chapter 6- Cell Membranes Secondary Active Transport- brings glucose into the blood stream Fluid Mosaic Model- general structure of membranes. Phospholipids form a bilayer in which proteins float. Hydrophilic head/hydrophobic tails/hydrophilic head Membranes vary in lipid composition, chain length, degree of sat and phosphate groups Phosphate functional group, charged, works well with water Fluidity depends on temperature and liquid composition: 37 degrees C Membranes contain proteins: o Peripheral- Do not penetrate the bilayer o Integral- Hydrophobic, hydrophilic regions, can go across bilayer Proteins and lipids- Van Der Waals forces (non-covalent) Anchored proteins are covalently attached Transmembrane proteins go all the way through the bilayer. Have one or more domains BONUS: 7 kJ/mole breaks phosphate bonds in ATP Membranes have carbs on outer layer: o Glycolipids- carbs+ lipids o Glycoproteins- carbs+ proteins Cells arrange by cell recognition and adhesion. Sponge Cells- Ex: When you cut yourself, cells heal back together Homotypic: Same molecule from both cells stick out and for a bond Heterotypic: different proteins Cell Junctions: o Tight junctions: help ensure and form a seal for directional movement of materials. o Desmosomes: link cells tightly, permit materials to move o Gap junctions: allow communication Selective Permeability- (permeable and impermeable) o Passive transportation: no outside energy, higher to lower (diffusion and osmosis) o Active transportation: requires ATP help Diffusion (passive)- random movement towards equilibrium- no “net” movement o Diffusion rate depends on: Temperature of solution Concentration gradient Diameter of molecules or ions in solute o Simple Diffusion- higher concentration to lower concentration Lipid-soluble passes easily (not sodium chloride) Polar and charged molecules cannot easily pass Osmosis- diffusion of water o Depends on number of particles present, not type Hypertonic: more solute particles outside than inside, water moves outside, cell shrinks (crenation) Hypotonic: more solute particles inside cell than outside, water moves inside, cell bursts 2 Isotonic: equal amount of solute particles Facilitated diffusion (still passive)- o channel proteins: lined with polar amino acids in bilayer (bridge) o carrier proteins: carrier gets particles in membrane (taxi) Ion channels: channel proteins with hydrophilic pores. Most are gated. Open to potassium and sodium *Mostly happens in neurons (lets sodium enter) * 3
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