The Plasma Membrane Is

Question

The plasma membrane is
A) a single-layered membrane that surrounds the nucleus of the cell.
B) a single-layered membrane enclosing the plasma.
C) the membrane surrounding the cell.
D) a membrane composed of tiny shelves or cristae.
E) a double-layered membrane surrounding the mitochondria of the cell.

Accepted Answer

The plasma membrane is the membrane that surrounds the cell and separates the interior of the cell from the external environment. It is composed of a double layer of phospholipids with embedded proteins and other molecules. A is incorrect because the membrane surrounding the nucleus is called the nuclear envelope. B is incorrect because the plasma membrane does not surround the plasma but is a component of it. D is incorrect because cristae are features found in the inner membrane of mitochondria, not the plasma membrane. E is incorrect because the double-layered membrane surrounding mitochondria is called the mitochondrial membrane.