Refer to the Figure Below Showing a Series of Events

Multiple Choice

Refer to the figure below showing a series of events in a cell. Which statement describes what is happening during the phase labeled 2 in the diagram?

A) Chemical bond energy is expended as a vesicle membrane inserts itself into and fuses with the cell membrane.
B) An enzyme associated with a vesicle opens a hole in the cell membrane, allowing the vesicle to fuse with it.
C) New phospholipids are synthesized at the interface between a vesicle and the cell membrane to allow the two lipid bilayers to fuse.
D) As a vesicle membrane contacts the cell membrane, the lipid bilayers of the two membranes merge to form one interconnected membrane.
E) Enzymes within a vesicle digest part of the vesicle membrane to allow the remaining portion to fuse with the cell membrane.