Question

question 20 (1 point)
the role of cholesterol is to
create a barrier.
allow ions into the cell.
maintain fluidity at low temperatures.
recognize a cell as safe.
all of the above.

Explanation:

Cholesterol is embedded in the cell - membrane. At low temperatures, it prevents the membrane from becoming too rigid by interacting with fatty - acid tails of phospholipids, thus maintaining membrane fluidity. It is not mainly for creating a barrier (phospholipid bilayer does that), allowing ions in (ion channels do that), or cell - recognition (glycoproteins and glycolipids do that).

Answer:

maintain fluidity at low temperatures.