Phosphate/phosphorus is present in which part of cell?

Phosphate/phosphorus is present in which
part of cell?
a) Cell membrane
b) DNA
c) RNA
d) All of the above
Correct Answer - D
Ans. D. All of the above
[Ref Principles of medical physiology /e p.116]
Phosphorus is a component of DNA, RNA, ATP and also the
phospholipids that form all cell membranes.
Nearly every cellular process that uses energy obtains it in the form
of ATP.
Thus, it is an essential element for all living cells and important for
energy utilization in the body