most structures in a cell are membrane-bound, but some arennot. which lacking a membrane is present in plant cells and not in animal cells

Answer 1

In plant cells, the structure that lacks a membrane and is not found in animal cells is the cell wall. The cell wall is composed primarily of cellulose and provides structural support and protection to the plant cell. In contrast, animal cells do not have a cell wall; they are surrounded only by a flexible plasma membrane.