Question

The structure of the cell membrane is described as a lipid bilayer.

Which of the following statements describes the membranes bilayer?
a) Two layers of proteins with fluid in between the layers
b) Two layers of phospholipids that control the equilibrium of the cell
c) One layer of phospholipids that control the equilibrium of the cell
d) One layer of proteins that form a protective barrier against invasion of the cell

Answer 1

The correct description for the cell membrane's bilayer is two layers of phospholipids that form a selectively permeable barrier controlling the cell's equilibrium.

Step-by-step explanation:

The correct statement that describes the membrane's bilayer is b) Two layers of phospholipids that control the equilibrium of the cell. The cell membrane's primary structure is the phospholipid bilayer, which is made up of two layers of phospholipids. The unique arrangement of these phospholipids, with hydrophilic 'heads' facing the exterior and interior aqueous environments and the hydrophobic 'tails' facing the interior of the membrane, creates a selectively permeable barrier. This configuration allows only certain substances, generally small and nonpolar, to pass through unaided, thus contributing to the equilibrium of the cell. Embedded within this bilayer are various proteins that perform a multitude of functions, from transport to signal reception, adding to the complexity and functionality of the cell membrane.