A researcher incubates a cell with radiolabeled amino acids. These amino acids are incorporated into the proteins as they are synthesized by the cell. Select which piece of data would indicate the incorporation of radiolabeled amino acids during protein synthesis?
A) Radioactivity levels would increase first at the nucleus, followed by the Golgi, and then the cell membrane.
B) Radioactivity levels would increase first at the nucleus, followed by the ribosomes, and then the secretory vesicles.
C) Radioactivity levels would increase first at the rough endoplasmic reticulum, followed by the Golgi, and then the secretory vesicles.
D) Radioactivity levels would increase first at the rough endoplasmic reticulum, followed by the nucleus, and then the secretory vesicles.

Radioactivity levels would increase first at the rough endoplasmic reticulum, followed by the Golgi, and then the secretory vesicles. Ribosomes attached on the rough ER will manufacture the proteins. The radioactivity will be seen here first. The ER transports the proteins to the Golgi for packaging, sorting, and modification. This is where the radioactivity will be seen next. The Golgi sorts and packages proteins into secretory vesicles, which will travel to the membrane for export. This is where the radioactivity will be seen last.