A) All internal cell membranes are similar in structure to the plasma membrane.
B) The only internal membrane of a cell that is similar to the plasma membrane is the nuclear membrane.
C) All internal membranes of a cell are just giant invaginations from the plasma membrane.
D) Vesicle membranes degrade as they fuse with the plasma membrane during exocytosis.

A) An electrical signal is passed through the blood, opening glucose channels within the membranes of cells.
B) Insulin molecules bind to glucose receptors, causing cellular responses to take up glucose.
C) The glucose molecules diffuse through the membrane.
D) Glucose pokes a hole in the cell's membrane, creating a channel through which it can move.

A) move large molecules in and out of the cell.
B) regulate water movement into the cell.
C) bind cell membranes to the cytoskeleton.
D) act as binding sites for signaling molecules.
E) maintain the proper fluidity of the plasma membrane.