Cell Wall

The cell wall is a rigid layer that surrounds the cell membrane in plant cells, fungi, and some bacteria. It provides structural support and protection for the cell, and also helps to maintain the shape of the cell.

Structure of Cell Wall

The cell wall is made up of cellulose, hemicellulose, and pectin in plant cells, while in fungi it is made up of chitin. These components give the cell wall its rigidity and strength.

Functions of Cell Wall

1. Structural Support: The cell wall provides structural support to the cell, helping it maintain its shape and preventing it from bursting under osmotic pressure.
2. Protection: It acts as a protective barrier, shielding the cell from physical damage and pathogens.
3. Regulation of Water: The cell wall helps regulate the movement of water into and out of the cell, maintaining turgor pressure and preventing wilting.
4. Support for Growth: It provides support for plant growth, allowing the plant to grow upright and providing rigidity to the stems and leaves.

Differences Between Cell Wall and Cell Membrane

Study Guide

Here are some key points to remember about the cell wall:

• The cell wall is a rigid layer that surrounds the cell membrane in plant cells, fungi, and some bacteria.
• It is made up of cellulose, hemicellulose, and pectin in plant cells, and chitin in fungi.
• The cell wall provides structural support, protection, and helps regulate water movement in the cell.
• It differs from the cell membrane in terms of structure, composition, and function.

When studying the cell wall, it's important to understand its composition, functions, and how it differs from the cell membrane.

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