Question

water is a source of ____________ for chemical reactions in cells.
(a) hydrogen atoms
(b) oxygen atoms
(c) energy
both (a) and (b)
(a), (b), and (c).

Explanation:

Water has the chemical formula H₂O, so it can provide hydrogen and oxygen atoms for cellular chemical reactions. It is not a direct source of energy for cells.

Answer:

D. Both (a) and (b)