Which of the following observations could lead researchers to conclude that membrane proteins move laterally in the plasma membrane?
A) A cell is freeze-fractured and splits the phospholipid bilayer into two layers, and the membrane proteins go with one of the layers.
B) Human and mouse sauce labeled with protein markers are fused, and the hybrid cell contains a mixing of proteins on the surface.
C) There are two types of protein receptors in plants to transport CO2 and NH4-; however, in some microorganisms, proteins that transport NH4 can also transport CO2.
D) Integral proteins on the surface of stomach cells can transport either acids or bases.
Answer: B) Human and mouse sauce labeled with protein markers are fused, and the hybrid cell contains a mixing of proteins on the surface.