membrane permiablity question Part C - How does phospholipid structure relate to

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membrane permiablity question

Part C - How does phospholipid structure relate to the selective permeability of the plasma membrane? A critical feature of the plasma membrane is that it is selectively permeable. This allows the plasma membrane to regulate transport across cellular boundaries- -a function essential to any cell's existence. How does phospholipid structure prevent certain molecules from crossing the plasma membrane freely? Drag the labels to fill in the table. Use only white labels for white targets, pink labels for pink targets, and blue labels for blue targets.

Explanation / Answer

Type of molecules Hydrophobic or Hydrophilic Able to cross lipid bilayer Transport protein required Non polar molecules Hydrophobic Can cross easily No transport protein required Ex: Hydrocarbons, CO2, O2 Polar molecules Hydrophilic Have difficulty in crossing Transport protein required to Ex: Glucose, water the hydrophobic part cross efficiently Ions Hydrophilic Have difficulty in crossing Transport protein required to Ex: Na+, K+, Ca+2, Cl- the hydrophobic part cross efficiently

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