How Does Phospholipid Structure Relate To The Selective Permeability Of The Plasma Membrane?

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How Does Phospholipid Structure Relate To The Selective Permeability Of The Plasma Membrane?

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a) hydrophobic b) can cross easily c) no transport protein required d) hydrophilic e) have difficulty crossing the hydrophobic part f) transport protein required to cross efficiently g) hydrophilic h) have difficulty crossing the hydrophobic part i) transport protein required to cross efficiently Explanation: The structure of the plasma membrane makes it selectively permeable, enabling it to regulate the transport of substances into and out of the cell. -Small, nonpolar molecules are hydrophobic, so they can easily cross the phospholipid bilayer of the plasma membrane. -Polar molecules and ions are hydrophilic, so they cannot very easily cross the hydrophobic portion of the plasma membrane (formed by the phospholipid tails). Water is an unusual molecule because, despite the fact that it is polar, it is small enough to pass directly through the hydrophobic interior of the lipid bilayer, albeit slowly. -Polar molecules and ions generally cross the plasma membrane with the help of transport proteins. For example, water crosses the bilayer rapidly via transport proteins called aquaporins.
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