Which of the following cellular structures lacks a membrane?

The cell wall is a rigid, non-living structure that surrounds the cell membrane of plant cells, bacteria, and some fungi. It is composed primarily of cellulose in plants and peptidoglycan in bacteria. Unlike other cellular structures, the cell wall does not have a membrane. It provides support and protection to the cell and helps maintain its shape. 

The Golgi apparatus, lysosome, and nucleus all have membranes that surround and protect their contents.