Smaller, lipid soluble molecules diffuse...

Smaller, lipid soluble molecules diffuse faster through cell membrane, but the movement of hydrophilic substances are facilitated by certain transporters which are chemically ....

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Protein. Substances that have a hydrophilic moiety, find it difficult to pass through the membrane. Their movement is facilitated by proteins present in membrane to cross the membrane.

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Substances (A)_____ in lipids diffuse through the membrane faster while substances that have a (B)____find if difficult to pass through the membrane.

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