Cell Membrane Transport Quiz

What type of molecules can freely pass across the phospholipid bilayer?

• Large, charged molecules

• Small, lipophilic molecules

• Polar molecules

• Ions

Which type of transport requires the expenditure of energy?

• Passive transport

• Simple diffusion

• Active transport

• Facilitated diffusion

What is the movement of water molecules across membranes by osmosis called?

• Active transport

• Facilitated diffusion

• Simple diffusion

• Osmosis

What is required for larger molecules or charged molecules to cross the plasma membrane?

• Lipid bilayer

• Membrane proteins

• Simple diffusion

• Osmosis

What is the direction of movement in passive transport?

• Low to high concentration

• High to low concentration

• Against a concentration gradient

• Requires ATP

What is the net movement of molecules from a region of higher concentration to lower concentration called?

• Active transport

• Simple diffusion

• Facilitated diffusion

• Osmosis

Which type of molecules can freely cross the plasma membrane without impediment during simple diffusion?

• Large, polar molecules

• Ions

• Small, non-polar molecules

• Proteins

What is the role of channel proteins in facilitated diffusion?

• They actively transport molecules

• They contain a hydrophilic pore to enable passage

• They break down molecules

• They store energy

What is the process called when water molecules move across a semipermeable membrane from a region of low solute concentration to a region of higher solute concentration?

• Active transport

• Simple diffusion

• Osmosis

• Facilitated diffusion

What are aquaporins?

• Proteins that transport ions

• Selective water channels

• Enzymes that break down water

• Lipids that store water