in the text area below compare and contrast a cell membrane and cell wall.

Brief Explanations:

Cell membrane is a thin, flexible layer around cells, controlling substance - entry and exit. Cell wall is a rigid outer layer in plant, fungal and some bacterial cells, providing structure and protection. Both are cell - boundary structures. Cell membrane is present in all cells, while cell wall is not. Cell membrane is mainly made of lipids and proteins, cell wall of cellulose (in plants), chitin (in fungi) etc.

Answer:

Similarities: Both are boundary - defining structures for cells. They play roles in the cell's interaction with its environment. Differences: Presence - cell membrane is in all cells, cell wall is in plant, fungal and some bacterial cells. Composition - cell membrane is mainly lipids and proteins, cell wall is cellulose (plants), chitin (fungi) etc. Flexibility - cell membrane is flexible, cell wall is rigid. Function - cell membrane controls substance movement, cell wall provides structural support and protection.