Which of the following statements about the lipid constituents of membranes is correct?（测试一）
A: Lateral movement of membrane lipids is catalysed by special proteins.
B: The inner and outer halves of the lipid bilayer are identical.
C: Lateral movement of membrane lipids occurs rapidly within the plane of the bilayer.
D: Transverse movement of membrane lipids within the bilayer is unrestricted.