Question

what is selective permeability?
a. the ability of the cell to produce energy.
b. the ability of the cell to divide and reproduce.
c. the ability of the cell membrane to regulate what enters and exits the cell.
d. the ability of the cell membrane to store nutrients.

what type of molecules require facilitated diffusion to cross the cell membrane?
a. water molecules
b. lipid molecules
c nonpolar gases
d larger or polar molecules and ions

Explanation:

• First question: Selective permeability is a property of the cell membrane. It means the cell membrane can control what substances enter and exit the cell. Option a is about energy production (related to mitochondria etc.), option b is cell division (related to cell cycle), option d is about storage (not the main function of selective permeability).
• Second question: Facilitated diffusion is for molecules that cannot easily pass through the non - polar lipid bilayer of the cell membrane. Water (a) can pass via osmosis (simple diffusion in some cases too, but not the best fit for facilitated diffusion here), lipid molecules (b) can pass through simple diffusion as they are non - polar, non - polar gases (c) can pass through simple diffusion. Larger or polar molecules and ions (d) need transport proteins (facilitated diffusion) to cross the membrane.

Answer:

• First question: C. The ability of the cell membrane to regulate what enters and exits the cell.
• Second question: D. Larger or polar molecules and ions.