cell structure and composition Flashcards
cell membranes: recall the basic structural components of phospholipids, explain the formation of phospholipid bilayers in an aqueous environment and the permeability properties of a phospholipid bilayer
structure of a phospholipid
hydrophilic phosphate head, choline, glycerol and hydrophobic fatty acid tails
what are micelles
phosphilipid sphere
properties of phospholipid bilayer
can’t flip but can move laterally as proteins break up the order, hence it is dynamic
what is the name of the membrane model
fluid mosaic model
what are liposomes
spherical bilayer enclosing droplet/drug
overall property of phospholipids as hydrophilic and hydrophobic sections
amphiphilic
if all C-C, what is the resulting phospholipid structure
saturated so densely packed
if some C=C, what is the resulting phospholipid structure
unsaturated so sparsely packed
what molecule decreases fluidity and permeability
cholesterol
basic structure of cholesterol
rigid 4C rings and a fluid hydrocarbon tail
what glycolipids are present on EC side of membrane
SM, PC
what glycolipids are present on IC side of membrane
negatively charged, PE, PS
what is the phospholipid permeable to
lipids (steroids), water, gases
what is the phospholipid impermeable to
cations, anions, small hydrophilic molecules (e.g. glucose), macromolecules (proteins, RNA)
