The statement 'the cell membrane regulates the transport of specific substances into and out of the cell' BEST describes the selective permeability of the cell membrane (Option A).
The cell membrane is a semi-permeable barrier because some substances can diffuse across the lipid bilayer while other substances cannot.
The lipid bilayer contains specific proteins called carriers or channels used to transport molecules/ions across the cell membranes.
For example, aquaporins are specific membrane protein channels that facilitate the transport of water (H2O) molecules into and out of the cell.
In conclusion, the statement 'the cell membrane regulates the transport of specific substances into and out of the cell' BEST describes the selective permeability of the cell membrane (Option A).
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