Question

Permeability is the condition of being capable of having materials flow into and out of a membrane. The permeability of a cell membrane is determined by how easily a molecule can diffuse across the membrane. Usually, only molecules that are fat-soluble can permeate across a cell membrane. Why is this the case?

A. Water-soluble molecules are nonpolar.
B. Water-soluble molecules are too large.
C. Cell membranes are composed of a lipid bilayer.
D. Cell membranes are composed of cytosol.

Answer 1

it is c

Step-by-step explanation:

Answer 2

C. Cell membranes are composed of a lipid bilayer.

Step-by-step explanation:

The cell membrane delimits the contents of the cell. A typical cell membrane is largely made up of phospholipids. Other components include the glycolipids, sterols, and proteins. The phospholipids component arrange themselves in a double layer (bilayer), forming a hydrophobic core.

Fat soluble molecules are able to permeate across the cell membrane due to the lipid bilayer components - lipid in itself being a form of fat.

The correct option is C.