Final answer:
In single-celled organisms, materials are stored primarily in vacuoles, versatile organelles that handle storage and digestion of macromolecules. The DNA of eukaryotic cells, such as animal cells, is located within the nucleus, and ribosomes are common to both eukaryotic and prokaryotic cells for protein synthesis.
Step-by-step explanation:
In single-celled organisms, materials are primarily stored in vacuoles. Vacuoles are versatile organelles that serve a variety of functions from storage to waste disposal. In plant cells, the role of the lysosomes is often carried out by vacuoles, which have the capacity to digest various macromolecules.
We find the cell's genetic material, DNA, within the nucleus in eukaryotic cells like animal cells. Both prokaryotic and eukaryotic cells contain ribosomes, essential for protein synthesis. Ribosomes can be found either floating freely in the cytoplasm or attached to the endoplasmic reticulum.
While organelles like the mitochondria, known as the powerhouse of the cell, are responsible for energy production, they are not primarily used for material storage in single-celled organisms. The correct answer to the provided question is C) Vacuoles.