The cyclic structure of D-(-)-fructose is known as a furanose structure. According to its structural representation, the furanose ring of fructose consists of:

Step-by-step solution

D-(-)-fructose forms a five-membered cyclic structure known as a furanose ring. This ring is formed by the intramolecular reaction between the hydroxyl group at C-5 and the ketone group at C-2, resulting in a hemiketal. The five-membered ring consists of four carbon atoms (C-2, C-3, C-4, and C-5) and one oxygen atom. Thus, the furanose ring of fructose contains four carbon atoms and one oxygen atom. Answer: Four carbon atoms and one oxygen atom