Membrane Permeability 2.5 Flashcards
What types of materials can easily pass through the membrane? Give three examples.
small, nonpolar/hydrophobic molecules (N2, O2, CO2). Also, H2O (small polar) can pass through in small amounts
What types of materials require a protein to pass through the membrane? Give an example.
Hydrophilic/polar, small molecules need a transport protein. (NH3)
True or False? Any molecule can use any transport protein.
False. They are specific to which molecules can pass.
What types of materials require a vesicle for export or a food vacuole for import?
They are for large macromolecules.
Where are plasma membranes found in a cell?
They are in the cell wall, or surrounding the cell.
What types of cells have a cell walls?
Plant cells, fungi, and prokaryotes.
How does the cell wall maintain cell structure?
It maintains the shape of the cell, prevents against cellular rupture at high pressure and helps the plant stand against gravity.
How does the cell wall protect the cell from hypotonic solutions?
It prevents any more water from entering the cell once it is full.
How do materials pass through the cell wall?
They pass through plasmodesmata (small holes between plant cells)
What composes the cell wall of a fungi?
chitin
What composes the cell wall of a plant?
cellulose
What composes the cell wall of a prokaryote?
peptidoglycan
