The cell membrane is made up of a. double layer of cellulose b. a single layer of cellulose c. a double layer of protein d. a double layer of phospholipids

D, Double layer of phospholipid

Cell membrane is the phospholipid bilayer. Phospholipids(phosphate+lipids molecules) form the basic structure of cell membrane, known as phospholipid bilayer.The each lipid molecule have the hydrophoic and hydrophillic end. the two lipid layer are attached by their hydophobic ends(tail region) and forms bilayer. The lipid bilayer also contains the integral proteins which are important for transporting substances(sugar molecules, ions) across the cell membrane.(Image)

explanation:

okay now i don't know this but for the pints nothing else to say bye

atp is used for energy.