Cells of the pancreas will incorporate radioactively labeled amino acids into proteins. This "tagging" of newly synthesized proteins enables a researcher to track their location. In this case, we are tracking an enzyme secreted by pancreatic cells. What is its most likely pathway?

a) ER -> lysosomes -> vesicles that fuse with plasma membrane
b) Golgi -> ER -> lysosomes
c) ER -> Golgi -> vesicles that fuse with plasma membrane
d) ER -> Golgi -> nucleus
e) nucleus -> ER -> Golgi


Answer: c) ER -> Golgi -> vesicles that fuse with plasma membrane

Biology & Microbiology

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Ribozymes are ________

a. laboratory-formed selectively permeable vesicles b. catalytic RNAs c. fossils of an early eukaryote d. dome-shaped layered structures formed by marine bacteria

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In a four-chambered, in which chamber is the

strongest contraction?

a. right ventricle b. left ventricle c. left atrium d. right atrium e. all chambers contract to the same degree

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Most of the water that evaporates from leaves passes out through the

A. epidermis. B. cuticle. C. stomata. D. spaces between epidermal cells. E. ends of xylem vessels.

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