Membrane Transport Quiz

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

• Large, charged molecules

• Small, lipophilic molecules

• Polar molecules

• Ions

Which process involves movement from high concentration to low concentration without energy expenditure?

• Active transport

• Facilitated diffusion

• Passive transport

• Osmosis

What is required for active transport to occur?

• No energy

• ATP hydrolysis

• Simple diffusion

• Osmosis

What determines the type of passive transport used?

• Size of the molecule

• Permeability of the molecule

• Concentration gradient

• Temperature

What is the role of channel proteins in membrane transport?

• Active transport

• Facilitated diffusion

• Osmosis

• Simple diffusion

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

• Small, non-polar molecules

• Ions

• Proteins

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

• Lipid bilayer

• Membrane protein

• Water channels

• Energy input

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

• Active transport

• Simple diffusion

• Osmosis

• Facilitated diffusion

What are integral proteins that function as selective water channels called?

• Carrier proteins

• Channel proteins

• Aquaporins

• Enzymes