All of the following are true about prokaryotic outer membranes EXCEPT:
A) They are lipid bilayers composed of identical phospholipids.
B) They are found only in Gram-negative bacteria.
C) They contain endotoxin.
D) They contain proteins involved in transport.
E) They contain lipopolysaccharide.

Question

Quizplus · Accepted Answer

Prokaryotic outer membranes are composed of two layers, an inner layer of phospholipids and an outer layer of lipopolysaccharides. The phospholipids in the inner layer are not identical, and there is no mention of this in the question stem. Therefore, option A is the correct answer. The other options are true – outer membranes are found only in Gram-negative bacteria, they contain endotoxin, they contain proteins involved in transport, and they also contain lipopolysaccharides.

All of the Following Are True About Prokaryotic Outer Membranes