Assume that the transport of a particular amino acid across the plasma membrane is observed (1 ) to occur only down its concentration gradient and (2 ) to slow when a similar amino acid is added to the extracellular fluid. The movement of the amino acid
through the membrane is most likely by
A) osmosis.
B) diffusion.
C) facilitated diffusion.
D) active transport.
E) pinocytosis.
Answer: C
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