#Question id: 2228
#Unit 2. Cellular Organization
Proton pumps are used in various ways by members of every domain of organisms: Bacteria, Archaea, and Eukarya. What does this fact most probably mean?
#Question id: 2229
#Unit 2. Cellular Organization
The difference between pinocytosis and receptor-mediated endocytosis is that:
#Question id: 2230
#Unit 2. Cellular Organization
Which of these statements about the composition of biological membranes is false?
#Question id: 2231
#Unit 2. Cellular Organization
Membrane proteins:
I) are sometimes covalently attached to lipid moieties.
II) are sometimes covalently attached to carbohydrate moieties.
III) are composed of the same 20 amino acids found in soluble proteins.
IV) move across the membrane unless they are anchored
Which of the following combination is correct?
#Question id: 2232
#Unit 2. Cellular Organization
A GPI anchor
a. serves to attach some proteins to the cytosolic face of the plasma membrane.
b. contains phosphotidylserine.
c. may be cleaved to release the protein from the membrane.
d. contains sugar residues in addition to lipid components.
e. contains phosphoethanolamine.
#Question id: 2233
#Unit 2. Cellular Organization
Membrane proteins may interact with biomembranes through
a. covalently attached fatty acid molecules.
b. covalently attached lipid molecules.
c. noncovalent protein-protein interactions.
d. hydrophobic α-helical domains.
e. noncovalent protein-lipid interactions.