3.2 Cellular Transport

What is the primary role of the cell membrane in a cell?

• To produce energy for the cell

• To control what enters and exits the cell

• To store genetic material

• To provide structural support like a cell wall

Which type of molecules can pass directly through the phospholipid bilayer without assistance?

• Small nonpolar molecules

• Proteins

• Charged ions

• Large polar molecules

What is facilitated diffusion?

• The engulfing of large molecules by the cell membrane

• The movement of molecules through protein channels without energy

• The movement of molecules from low to high concentration using energy

• The release of waste materials from the cell

What is the energy source used in active transport to move molecules against their concentration gradient?

• Carbon dioxide

• ATP

• Oxygen

• Glucose

What is the process called when a cell takes in large molecules by forming vesicles?

• Facilitated diffusion

• Exocytosis

• Simple diffusion

• Endocytosis