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 of the following is true about passive transport?

• It requires ATP

• It moves substances from low to high concentration

• It involves movement along a concentration gradient

• It requires membrane proteins

What is required for active transport to occur?

• No energy

• ATP hydrolysis

• Movement along a concentration gradient

• Simple diffusion

Which process involves the movement of water molecules across membranes?

• Active transport

• Facilitated diffusion

• Osmosis

• Simple diffusion

What determines the type of passive transport used?

• The size of the cell

• The permeability of the molecule

• The temperature of the environment

• The presence of 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?

• Lipid molecules

• Selective water channels

• Carrier proteins

• Enzymes