Question

Which option correctly describes the structure of cell walls? A)Cell walls are rigid. They block the movement of all molecules. B)Cell walls are flexible. They block the movement of all molecules. C)Cell walls are rigid. Small molecules like water or oxygen can pass through them. D)Cell walls are flexible. Small molecules like water or oxygen can pass through them.

Answer 1

Answer:The correct option is C) Cell walls are rigid. Small molecules like water or oxygen can pass through them.

Step-by-step explanation:

Cell walls are found in plant cells and some other organisms. They provide structural support and protection to the cell. The cell wall is made up of a rigid material called cellulose, which gives it its strength.

Cell walls are permeable, meaning that they allow certain substances to pass through them. Small molecules like water and oxygen can pass through the cell wall via small pores or channels. However, larger molecules, such as proteins and carbohydrates, cannot pass through the cell wall.

This selective permeability of the cell wall allows the cell to control the movement of substances in and out of the cell, maintaining its internal environment. It also helps prevent the cell from bursting under osmotic pressure.

In summary, cell walls are rigid structures composed of cellulose. They are permeable, allowing small molecules like water and oxygen to pass through, while blocking larger molecules.