Final answer:
A cell comprising only a cell membrane, cytoplasm, ribosomes, and chromosome is indicative of a prokaryotic cell, which lacks a nucleus and other membrane-bound organelles.
Step-by-step explanation:
The cell that contains only cytoplasm, ribosomes, cell membrane, and chromosome, and lacks any other parts, would represent a prokaryotic cell. Prokaryotic cells are characterized by the absence of a nucleus and other membrane-bound organelles. The presence of these components and the absence of structures like mitochondria, a nucleus, or endoplasmic reticulum is consistent with the cell being a prokaryote, such as bacteria or archaea.