CH 15 set 4

The outer membrane of the nucleus is continuous with the membrane of which other organelle?
A. endosome
B. Golgi apparatus
C. mitochondrion
D. endoplasmic reticulum
E. peroxisome

D. endoplasmic reticulum

Which organelle receives proteins and lipids from the endoplasmic reticulum, modifies them, and then dispatches them to other destinations in the cell?
Choose one:
nucleus
peroxisome
endosome
mitochondrion
Golgi apparatus

Golgi apparatus

How do the interiors of the ER, Golgi apparatus, endosomes, and lysosomes communicate with each other?
A. They do not communicate with one another.
B. by open pores that allow ions to exit and enter the organelles
C. by small vesicles that bud off of one organelle and fuse with another
D. by excreting hormones and other small signaling molecules
E. by fusing with one another

C. by small vesicles that bud off of one organelle and fuse with another

Most mitochondrial and chloroplast proteins are made within which part of the cell?
Choose one:
endoplasmic reticulum
cytosol
Golgi apparatus
peroxisome
mitochondrion or chloroplast itself

cytosol

What happens to proteins with no signal sequence that are made in the cytosol?
Choose one:
They are taken up by lysosomes.
They are secreted.
They are degraded by proteases.
They are returned to their organelle of origin.
They remain in the cytosol.

They remain in the cytosol.

Which proteins bind to nuclear localization signals on newly synthesized proteins?
Choose one:
nuclear pore proteins
cytosolic fibrils
nuclear export receptors
signal-recognition particles (SRPs)
nuclear import receptors

nuclear import receptors

Proteins destined for the Golgi apparatus, endosomes, lysosomes, and even the cell surface must pass through which organelle?
Choose one:
peroxisome
ER
mitochondrion
nucleus

ER

As a polypeptide is being translocated across the membrane of the endoplasmic reticulum, a stop-transfer sequence can halt the process. What eventually becomes of this stop-transfer sequence?

The movement of materials from the plasma membrane, through endosomes, and then to lysosomes describes which type of pathway?

Which proteins play a central role in the fusion of a vesicle with a target membrane?

Through which of the following do proteins travel from one cisterna to the next in the Golgi apparatus?

How are newly made lipids supplied to the plasma membrane?

Phagocytosis is a process by which cells do which of the following?

Which cellular compartment acts as the main sorting station for extracellular cargo molecules taken up by endocytosis?