Ions Are Charged and So Have Very Low Permeability Through

Ions are charged and so have very low permeability through a hydrophilic lipid membrane. However, ions are able to enter and exit cells by

A) active transport using the energy of ATP.
B) facilitated transport using a carrier protein.
C) diffusion through a ligand-gated channel.
D) active transport using the energy of ATP and facilitated transport using a carrier protein.
E) active transport using the energy of ATP and diffusion through a ligand-gated channel.

Correct Answer:

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