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) free ribosome → cytosol → vesicle → extracellular fluid
B) rough ER → Golgi complex → Golgi vesicle → extracellular fluid
C) rough ER → smooth ER → Golgi complex → Golgi vesicle → extracellular fluid
D) smooth ER → Golgi complex → Golgi vesicle → extracellular fluid
E) smooth ER → Golgi complex → lysosome → extracellular fluid

Question

Quizplus · Accepted Answer

The pathway of a protein that is destined for export out of the cell involves the rough ER, where the protein is synthesized and modified, and the Golgi complex, where it is further modified and packaged into vesicles. The vesicles then transport the protein to the plasma membrane for exocytosis into the extracellular fluid. Therefore, the radioactive-tagged amino acid would travel from the rough ER to the Golgi complex, and eventually to the extracellular fluid. This pathway is represented by choice B.

You Were Able to Radioactively Tag and Thereby Trace an Amino