Imagine a Cell Needing an Essential Specific Amino Acid (One

Imagine a cell needing an essential specific amino acid (one the cell cannot synthesize) . What process could acquire the amino acid most quickly?

A) phagocytize and digest bacteria, extract the specific amino acid from the residue, and release to the cytoplasm
B) place a transporter protein in the membrane that could carry the amino acid across the membrane
C) use receptor-mediated endocytosis
D) use simple diffusion, because the concentration of the needed amino acid will be zero and the gradient will always be maximized