Final answer:
Bacteria is the type of cell made of only DNA, ribosomes, cytoplasm, and a cell membrane.
Step-by-step explanation:
The cell that is made of only DNA, ribosomes, cytoplasm, and a cell membrane is bacteria. Bacteria are prokaryotic cells, which means they lack a nucleus and other organelles found in eukaryotic cells. However, they contain DNA, ribosomes, cytoplasm, and a cell membrane.