You were able to radioactively tag and thereby trace an amino acid that is used to make insulin, a hormone that will be exported out of the cell. The pathway of the tagged amino acid would be ________.
A. rough ER ? Golgi complex ? Golgi vesicle ? extracellular fluid
B. free ribosome ? cytosol ? vesicle ? extracellular fluid
C. smooth ER ? Golgi complex ? lysosome ? extracellular fluid
D. rough ER ? smooth ER ? Golgi complex ? Golgi vesicle ? extracellular fluid
E. smooth ER ? Golgi complex ? Golgi vesicle ? extracellular fluid
Answer: A
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