Phosphorus plays an important role within the structures of the body. Which of the following structures is phosphorus found in?

a. bones

b. cell membranes

c. DNA

d. all of the above

D. All of the above

Phosphorus is an important component of bones in the form of calcium phosphate compound called hydroxyapatite. In cell membranes, phosphorus is present in the form of phosphates in phospholipds, which form an integral part of lipid bilayer in cell membrane. For DNA, phosphates form the part of DNA's basic unit called nucleotide. Each nucleotide consists of a phosphate group, a sugar and a nitrogenous base.