You are tracing the path of secretory protein from its synthesis to its export from a cell. You have added radioactive amino acids to a culture of cells, and then measured the amount of radioactivity that shows up in the proteins of each of the following fractions at different times after the addition. List the order in which the proteins of these fractions first exhibit radioactivity. I â secretory vesicles
II â rough ER
III â smooth ER
IV â Golgi
V â nucleus

a. III â II â I â out of the cell
b. IIIâ II â IV â V âout of the cell
c. V â III âII â I â out of the cell
d. IVâ III â II â I â out of the cell
e. II â III â IV â I â out of the cell

One function of the poly-a tail on eukaryotic mrna sequences is to the mrna be transported from the nucleus to the cytoplasm. prokaryotic mrna also has a poly-a tail. choose the best explanation of the prokaryotic poly-a tail. a. prokaryotic poly-a tails have the same functions as eukaryotic poly-a tails, because this process is highly conserved throughout different species. b. prokaryotic poly-a tails aren't important, because prokaryotes don't have nuclei. c. prokaryotic poly-a tails have other functions, because prokaryotes don't have nuclei. d. prokaryotic poly-a tails are composed of a different molecular structure compared with eukaryotic poly-a tails.

Which excerpt from the land, part 4 best supports the claim that paul is a talented horseback rider? a/“figure that says more than anything else! now, i want to ride that stallion! " b/my daddy shook his head. "paul only rides horses he knows. ” c/? i glanced over at the other rider. the fellow was older than i, and had the weight of a man on him. d/a man out of alabama, man name of ray sutcliffe, told my daddy i was such a good rider, he wanted me to ride some races for him.

What are the doorways into and out of cells, attached to the membrane, and built in the rough er.