The fluid nature of the membranes is attributed to a lateral movement of  

A.  protein channels.
B.  phospholipid molecules.
C.  antigen molecules.
D.  pumps such as the proton pump.
E.  the entire lipid bilayer.


B.  phospholipid molecules.

Biology & Microbiology

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In an amphibian embryo, a band of cells called the neural crest

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Biology & Microbiology