It's like a gateway guard or the airplane security. It controls what gets in and out.
It lets certain things through, and blocks certain things, categorized by size.
a semi-permeable membrane.
no
Yes, how else could the cell live. Cell membranes have structures (holes) in them to allow things to move in and out. These holes are special structures in the membrane and they "control" what goes across the membrane. I have made a link below to a diagram of the cell membrane to show some of these structures.
When looking at a cell as a factory, the cell membrane is like the factory outer walls.
Well a tea bag is an example my teacher uses for a cell membrane because there are tiny pores in the cell membrane that allow certain things into and out of the cell. As for the tea bag it allows things in but nothing out, only the tea leaves flavour is let out but not the tea leaves. If your doing a project, play doh or jello works just as fine :D
They are not holes.They are membrane proteins.
Cell Membrane
the answer is the cell membrane
yes
yes
Yes, how else could the cell live. Cell membranes have structures (holes) in them to allow things to move in and out. These holes are special structures in the membrane and they "control" what goes across the membrane. I have made a link below to a diagram of the cell membrane to show some of these structures.
When looking at a cell as a factory, the cell membrane is like the factory outer walls.
They are called porins and help in the transfer of materials in and out of the cell.
yes
Well a tea bag is an example my teacher uses for a cell membrane because there are tiny pores in the cell membrane that allow certain things into and out of the cell. As for the tea bag it allows things in but nothing out, only the tea leaves flavour is let out but not the tea leaves. If your doing a project, play doh or jello works just as fine :D
Both membranes protect parts of the cell.
When looking at a cell as a factory, the cell membrane is like the factory outer walls.
the outer membrane
A good item for a cell membrane would be a thin plastic or cardboard