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
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A) gastrointestinal tract B) respiratory tract C) cerebrospinal fluid D) liver
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
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
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.