You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Main content of bilayer cell membrane is: March 2009 and explain in detail?
Ans. B: CholesterolBiological membranes typically include several types of lipids other than phospholipids. A paicularly impoant example in animal cells is cholesterol, which helps strengthen the bilayer and decrease its permeability.Cholesterol also helps regulate the activity of ceain integral membrane proteins. Integral membrane proteins function when incorporated into a lipid bilayer.Because bilayers define the boundaries of the cell and its compaments, these membrane proteins are involved in many intra- and inter-cellular signaling processes.