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 $\rarr$ cytosol $\rarr$ vesicle $\rarr$ extracellular fluid
B)rough ER $\rarr$ Golgi complex $\rarr$ Golgi vesicle $\rarr$ extracellular fluid
C)rough ER $\rarr$ smooth ER $\rarr$ Golgi complex $\rarr$ Golgi vesicle $\rarr$ extracellular fluid
D)smooth ER $\rarr$ Golgi complex $\rarr$ Golgi vesicle $\rarr$ extracellular fluid
E)smooth ER $\rarr$ Golgi complex $\rarr$ lysosome $\rarr$ extracellular fluid

Question

Quizplus · Accepted Answer

The pathway of the tagged amino acid would be through the rough ER where the synthesis of insulin occurs, then transported to the Golgi complex for modification and packaging into Golgi vesicles. Finally, the Golgi vesicles containing the insulin hormone would be secreted out of the cell into the extracellular fluid. Therefore, choice B is the best answer as it correctly follows the pathway of protein synthesis and secretion.

You Were Able to Radioactively Tag and Thereby Trace an Amino