Membrane structure and function
Selective permeability, phospholipid bilayer, fluid mosaic model,
animal cell’s plasma membrane, integral proteins, transmembrane
proteins, peripheral proteins
some functions of membrane proteins- transport, cell-cell recognition-
glycolipids and glycoproteins
Synthesis and sidedness
Membrane structure results in selective permeability
The permeability of the lipid bilayer- hydrophobic nonpolar molecules
such as hydrocarbons, carbon dioxide, oxygen and lipids can cross
membranes
Passive transport
Diffusion, concentration gradient, osmosis, tonicity, isotonic, hypotonic
Animal cells- lysis, crenate (shrink) Plant cells- Turgid, flaccid
Facilitated diffusion
Active transport
Movement against the concentration gradient requires energy
sodium potassium pump
Membrane potentials by ion pumps
Electrochemical gradient
Bulk transport- exocytosis and endocytosis, ligands, phagocytosis,
pinocytosis
Docsity.com
