Ascientist observes a cell that is surrounded by a cell wall and that lacks a nucleus and membrane-bound organelles. what can the scientist conclude about the cell?

The scientist can conclude that this is a prokaryotic cell.

A cell wall is a structure located outside the cell membrane, providing support and protection. A cell wall can be found in most of the prokaryotic cells, in algae, plants and fungi. In addition, this cell does not have any membrane-bound organelles or a nucleus, therefore, it is a prokaryotic cell.

Prokaryotes are unicellular organisms which lack nucleus and other membrane-bound organelles.