what is the Role of cholesterol in membrane fluidity?

A red blood cell's intracellular salt concentration is around 150 mM. The cell is placed in a 500 mM sodium chloride beaker. (a) Explain how osmosis will affect the cell if the cell membrane is permeable to water but not to ions. (b) If the membrane were permeable to ions, which direction would solutes diffuse in: into or out of the cell?

One of the symptoms of diabetes mellitus (sugar diabetes ) is extreme thirst . What brings about this feeling of thirst? Explain in terms of osmosis.

How does the lipid solubility affect the permeability of solute through biological membranes?

Describe what gap junction are, emphasizing on how they are different two other cellular points of contact, their protein components and cellular function. Describe the three main sources of membrane fluidity.  Describe in detail what proteoglycans are, including their hygroscopicity and biological roles.

Describe the different types of membrane transport. Which require energy, and which are passive?

How to store membrane vesicles without losing activity of any constituents?

What characteristics distinguish facilitated diffusion from active transport?