Assume That the Import of a Particular Amino Acid Across

question 115

Multiple Choice

Assume that the import of a particular amino acid across the plasma membrane is observed (1) to occur onlydown its concentration gradient and (2) to slow when a different but 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.

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