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 energy expenditure?

• Passive transport

• Simple diffusion

• Active transport

• Osmosis

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

• Active transport

• Facilitated diffusion

• Simple diffusion

• Osmosis

What is the role of channel proteins in membrane transport?

• Active transport

• Facilitated diffusion

• Osmosis

• Simple diffusion

What happens to molecules during passive transport?

• They move from low to high concentration

• They require ATP to move

• They move from high to low concentration

• They require membrane proteins to move

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 in simple diffusion?

• Large, polar molecules

• Ions

• Small, non-polar molecules

• Proteins

What aids the passive movement of molecules across the cell membrane in facilitated diffusion?

• Lipid bilayer

• Membrane protein

• Phospholipids

• Water channels

What is the diffusion of free water molecules across a semipermeable membrane called?

• Active transport

• Simple diffusion

• Osmosis

• Facilitated diffusion

What are aquaporins?

• Lipid molecules

• Selective water channels

• Carrier proteins

• Enzymes