Selectively permeable <span>membranes can be found around a variety of cells and places. The most common </span>example is the phosphoric bi-layer cell membrane that surrounds every cell in our bodies. Another example<span> of a </span>selectively permeable membrane is the inner membranes of an egg.<span>Selectively permeable membranes can be found around a variety of cells and places. The most common example is the </span>phospholipid bilayer<span> cell membrane that surrounds every cell in our bodies. Another example of a selectively permeable membrane is the inner membranes of an egg.</span>
These molecules require the help of specific transport proteins which are embedded in the phospholipid bilayer. Transport may occur through facilitated transport or active transport.
B. Proteins
Enzymes are a type of protein which act as catalysts to speed up reactions.