B2.1 - Membrane Transport Flashcards
lipid bilayer
two layers of lipids
semi-permeable membrane
factors influencing permeability
size & charge
large & polar = non permeable (glucose)
small & non-polar = permeable (oxygen)
types of transports
diffusion
facilitated diffusion
active transport
diffusion
passive movement of particles from an area of high concentration to an area of low concentration
functions of integral & peripheral proteins (JETRAT)
junction
enzymes (ATP syntahse)
transport (channel & pump proteins)
recognition (glycoproteins - antibodies)
attachment
transduction of hormones
components of phospholipid bilayer “fluid mosaic model”
amphipathc phospholipid (hydrophilic head, hydrophobic tail)
peripheral protein
integral protein
glycoprotein
carbohydrate
cholesterol
integral membrane protein
transmembrane protein
amphipathic
ex: ATP synthase, channel protein, protein pump
peripheral membrane proteins
only attached to surface
hydrophilic
ex: glycoproteins (cell recognition)
osmosis
net movement of water across semi permeable membrane to areas of high solute concentration
aquaporin
channel protein that facilitates water movement
facilitated diffusion
passive movement of particles from an area of high concentration to an area of low concentration with use of channel proteins to allow permeability
active transport
movement of particles from low concentration to high concentration
requires energy
only move particles one way
protei pumps are molecule specific
glycoprotein form & function
protein & carb chain
cell recognition
joins cells together
glycolipid form & function
lipid + carb
found in eukaryotes
cell recognition –> immune system
