#Question id: 2151
#Unit 2. Cellular Organization
Which of the following statement(s) is (are) true of transmembrane proteins?
a. All contain a hydrophobic α helix.
b. Some serve as membrane attachment sites for peripheral membrane proteins.
c. Some contain more than one membrane-spanning domain.
d. All are asymmetrically oriented in the lipid bilayer.
#Question id: 2152
#Unit 2. Cellular Organization
Precursors of membrane phospholipids are
a. soluble in the cytosol.
b. incorporated into biosynthetic intermediates.
c. sometimes complexed with fatty-acid-binding proteins.
d. stored in glycerolosomes.
e. sometimes activated by conjugation with CDP.
#Question id: 2153
#Unit 2. Cellular Organization
Membrane phospholipids include
a. cholesterol.
b. plasmologens.
c. sphingolipids.
d. triglycerides.
e. bile acids.
#Question id: 2154
#Unit 2. Cellular Organization
Membrane lipids are distributed appropriately between the two leaflets of a given membrane by
a. dockases.
b. trumpases.
c. fatty acid desaturases.
d. flippases.
e. transmembrane tunnelases.
#Question id: 2155
#Unit 2. Cellular Organization
Cholesterol is
a. unrelated to any plant lipids.
b. not found in chloroplast membranes.
c. encoded by an intron-containing gene on chromosome 23.
d. relatively abundant in the plasma membrane and endocytic membranes.
e. synthesized in the ER.
#Question id: 2156
#Unit 2. Cellular Organization
Proteins known to be involved in Golgi apparatus independent transport of lipids include
a. StAR protein.
b. Neimann-Pick C1 (NPC1) protein.
c. HMG CoA reductase.
d. acyl:cholesterol acyl transferase (ACAT).
e. cholesterol 7α-hydroxylase.