E. coli grows from 0.10 to 0.50 kg dry cell m^-3 in 1 h. Assuming exponential growth during this period, evaluate the specific growth rate 

#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.

#Question id: 2153

#Section 2: General Biology

Membrane phospholipids include

a. cholesterol.            

b. plasmologens.        

c. sphingolipids.         

d. triglycerides.                      

e. bile acids.