Five ways that the membrane can deal with materials?

Answer 1

1. Hydrophobic molecules (Hydrocarbons and Oxygen) can cross with ease because they can dissolve in the lipid bi layer.

2. Small polar (uncharged) molecules will pass (water and carbon dioxide).

3. Large polar (uncharged) molecules will not pass (sugar).

4. Ions will not readily pass (H+, Na+, Cl-).

5. Large external materials can be taken in by the cell via endocytosis.

6. Large internal materials can be released by the cell via exocytosis.

Answer 2

The membrane can handle materials through simple diffusion, facilitated diffusion, active transport, endocytosis, and exocytosis. Simple diffusion allows small, non-polar molecules to pass directly through the membrane. Facilitated diffusion uses carrier proteins to help transport larger or polar molecules. Active transport requires energy to move molecules against the concentration gradient. Endocytosis engulfs particles through the cell membrane. Exocytosis releases materials outside the cell.

Answer 3

The membrane deal with materials in a unique manner. It is selectively permeable which will allow materials in and out of the cell.

Answer 4

It acts as a selective gate-keeper.