Cell Biology:
Intracellular Trafficking
Questions
DIRECTIONS: Each item below contains a question or incomplete
statement followed by suggested responses. Select the one bestresponse to
each question.54.Endocytosis of low-density lipoprotein (LDL) differs from phagocyto-
sis of damaged cells in which of the following?
a. Use of membrane-enclosed vesicles in the uptake process
b. Coupling with the lysosomal system
c. Dependence on acidification
d. Use of clathrin-coated pits
e. Use of hydrolases55.In the signal hypothesis, which of the following is the function of the
signal recognition particle (SRP)?
a. Binds the N-terminal sequence of the newly synthesized peptide to the ribosome
b. Induces an immediate increase in the translation rate
c. Prevents degradation of newly synthesized peptides by proteases
d. Binds the docking protein to the ER membrane
e. Enzymatically cleaves the newly synthesized peptide from the signal sequence127Copyright © 2007 by The McGraw-Hill Companies, Inc. Click here for terms of use.