Which statement is true about a cell wall but not a cell membrane?

• A. It contains embedded proteins for transport.
• B. It is selectively permeable.
• C. It is composed primarily of phospholipids.
• D. It provides structural support to the cell.

Answer: (D)

Verified step by step guidance

1. Understand the basic structure and function of a cell wall: The cell wall is a rigid layer that provides structural support and protection to the cell. It is found in plants, fungi, and some prokaryotes, but not in animal cells.
2. Differentiate between cell wall and cell membrane: The cell membrane, also known as the plasma membrane, is a flexible, selectively permeable barrier that surrounds the cell, composed primarily of a phospholipid bilayer with embedded proteins.
3. Identify the unique feature of the cell wall: Unlike the cell membrane, the cell wall is not primarily composed of phospholipids. Instead, it is made of cellulose in plants, chitin in fungi, and peptidoglycan in bacteria, which provides rigidity and structural support.
4. Evaluate the statements: The statement 'It provides structural support to the cell' is true for the cell wall but not for the cell membrane, as the membrane's primary role is to regulate the movement of substances in and out of the cell.
5. Conclude the analysis: The correct statement about the cell wall is that it provides structural support to the cell, distinguishing it from the cell membrane, which is involved in transport and selective permeability.