5 Questions
What percentage of membrane proteins are transporters?
Up to 30% of membrane proteins are transporters.
Explain the factors that influence the relative permeability of the lipid bilayer to molecules.
The relative permeability of the lipid bilayer is influenced by molecule size and solubility in hydrophobic fatty acids of phospholipid molecules. Polar molecules are impermeable to the lipid bilayer, while smaller and less polar molecules diffuse more rapidly across the bilayer.
What is the rate of passive polar diffusion of non-polar diethylurea compared to urea, and why?
The rate of passive polar diffusion of non-polar diethylurea is 50 times greater than urea due to its non-polar ethyl groups.
Explain the types of passive transport through biological membranes.
Passive transport through biological membranes includes simple diffusion, facilitated diffusion, and osmosis.
Define osmosis and explain the terms isotonic, hypertonic, hypotonic, and osmotic pressure.
Osmosis is the movement of water to balance solute concentration across biological membranes. Isotonic refers to equal solute concentration on both sides of the plasma membrane, hypertonic means higher solute concentration outside the cell, hypotonic means lower solute concentration outside the cell, and osmotic pressure is the hydrostatic pressure required to stop the net flow of water across the membrane due to osmosis.
Test your knowledge of relative permeability through artificial phospholipid bilayers with this quiz. Explore how molecule size and solubility impact transport through biological membranes. Understand the impermeability of polar molecules and the factors influencing rapid diffusion across lipid bilayers.
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