Question

Animal and Plant Cells

Pre-Test Active
1
2
3
4
5.1
67
10
What does it mean for a membrane to be selectively permeable?
O Only certain molecules are allowed to pass through.
The membrane is rigid and only allows water to pass through.
All types of molecules are able to pass into the cell.
The membrane is rigid and nothing can enter or leave the cell.

Answer 1

A selectively permeable membrane controls the movement of substances in and out of cells based on their size or specific transport mechanisms.

Step-by-step explanation:

A selectively permeable membrane allows only certain molecules to pass through while restricting the movement of others. This property is essential for regulating the transport of substances in and out of cells.

For example, in the plasma membrane of animal and plant cells, small molecules like oxygen and carbon dioxide can easily diffuse through, while larger molecules like proteins and ions require specific transport mechanisms.

This selective permeability helps maintain a stable internal environment within the cell and ensures that essential molecules and ions are transported in and waste products are transported out.

Learn more about Selective permeability of cell membranes