BIO-198 Exam 1 Study Questions and Correct Answers

Ionic bond the complete transfer of electrons, a bond between a metal and a non-metal Covalent bond electrons are shared, a bond between 2 non-metals Polar bond uneven sharing of electrons Ex. H20 Non-polar bond even sharing of electrons Ex. CH4 Lipids a diverse group of hydrophobic molecules to keep water inside and/or outside of a cell phospholipids the phosphate group of lipids that keeps water out of the cell contains a hydrophillic head with hydrophobic tails liposomes an artificial membrane-bound vesicle that is made up of a phospholipid bilayer Saturated Lipids hydrophobic tails of phospholipids that has all single bond hydrogens Unsaturated Lipids hydrophobic tails of phospholipids that has fewer then all the hydrogens , with at least one double bond Diffusion the movement of something across a lipid bilayer to establish equilibrium Osmosis diffusion of water through a semi-permeable membrane Hypertonic vesicle shrinks, concentration higher outside cell Hypotonic vesicle swells, concentration higher inside cell What is the permeability scale of water from High to Low? Hydrophobic molecules - O2,N2