Given statement: Biological membranes in cells are typically composed of 2 layers of phospholipids. This statement is absolutely true.
The biological membranes in cells are generally known as plasma membranes which consist of two layers of lipids, proteins, and carbohydrates. The exterior portion of the plasma membrane is a hydrophilic, polar head whereas the interior portion consists of a hydrophobic, non-polar tail.
Some proteins are attached to the surface of the membrane [peripheral proteins] whereas some proteins are found embedded in it [integral proteins]. Carbohydrates are found to be attached to the lipids or proteins on the extracellular side of the membrane, leading to the formation of glycolipids and glycoproteins.
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