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please help-plasma membrane

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I got this question marked wrong on a paper. Unfortunately, my prof didn't explain.

_________________ subtances can pass through the plasma membrane.

I put "nonpolar". What is wrong with this and does anyone know the correct solution/answer? Thanks all.

Nonpolar is wrong. Polar water molecules pass through easily.

There are three ways substances can pass true. I have no clue to the answer if one word is desired. "Transported" will work, however it is an incompleted answer. Visit the prof.

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