SAT® Subject Test in Biology

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Transport Across Membranes

SATBIO-TKMNVN

A cell membrane regulates which substances can enter and leave the cell based upon their size and polarity.

Which mode of cell transport is the movement of a substance from a high concentration to an area of lower concentration without the use of protein channels or energy?

A

Simple diffusion.

B

Facilitated diffusion.

C

Osmosis.

D

Active transport.

E

Isotonic.