Which of the following substances would be able to diffuse across the plasma membrane without the assistance of a transport protein? All of these substances would be able to cross the plasma membrane without a transport protein All of these substances would require a transport protein to cross the plasma membrane A lipid-soluble drug (e.g. steroids) A small, uncharged molecule A gaseous molecule of oxygen
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g. steroids) would be able to diffuse across the plasma membrane without the assistance of a transport protein because lipid-soluble substances can pass through the lipid bilayer of the membrane. Show more…
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