#Question id: 2147
#Section 2: General Biology
Movement of water across membranes is facilitated by proteins called:
#Question id: 2148
#Section 2: General Biology
The specificity of the potassium channel for K+ over Na+ is mainly the result of the:
#Question id: 2149
#Section 2: General Biology
A ligand-gated ion channel (such as the nicotinic acetylcholine receptor) is:
#Question id: 2150
#Section 2: General Biology
Which of the following increase(s) membrane fluidity?
#Question id: 2151
#Section 2: General Biology
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
#Section 2: General Biology
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.