Researchers supplied a short pulse of radioactively labeled leucine, followed by a long chase of unlabeled leucine, to cells that secrete digestive enzymes. The bulk of the radioactive label was initially found in the rough ER, then in the Golgi apparatus, then in secretory vesicles, and finally outside the cell. These results support which of the following hypotheses?

+1 vote

 

Microtubules and other elements of the cytoskeleton are dynamic—they grow and shrink.

Secreted proteins are synthesized in the rough ER and travel through the Golgi apparatus to be packaged into secretory vesicles that fuse with the plasma membrane.

Materials enter cells via endocytosis and leave cells via exocytosis.

Cargo is transported through the endomembrane system in vesicles that contain molecular "zip codes."

 

asked Dec 25, 2012 in Biology by anonymous
    

1 Answer

+1 vote

 

Secreted proteins are synthesized in the rough ER and travel through the Golgi apparatus to be packaged into secretory vesicles that fuse with the plasma membrane.

 

answered Dec 25, 2012 by JaFajx ~Expert~ (464 points)

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