How acell would be affected if the cell membrane did not have 1.Cholestrol molecule 2.membrane proteins

Cholesterol is an important component of animal cell
membranes, comprising up to half the total lipids in some cells. Because it has a rigid
ring structure, cholesterol lends strength to cell membranes and helps the cell hold its
shape. Cholesterol also helps to maintain the permeability of the cell membrane to small
molecules, and may play a part of protecting cells from freeze damage. Hence a cell
without cholesterol in its membrane would not hold its shape well and would have
difficulty with passage of ions across the
membrane.

Proteins have many functions in the cell
membrane. Some proteins are on the membrane surface; these allow attachment of cells to
surfaces or to one another. Proteins also are the main component of the major
histocompatibility complex, a group of chemical markers on the outside of each cell that
allow the immune system to distinguish self from
non-self.

Proteins embedded in the cell membrane function
in transport across the membrane. Some work as pores to allow molecules to pass in and
out freely by diffusion, while others perform active transport, attaching to specific
molecules and moving them across the cell membrane against the concentration gradient. A
cell without proteins in the membrane would be unable to move most molecules across the
membrane and would quickly die.