Understanding Active and Passive Transport

What is the main function of the cell membrane?

• To produce energy for the cell

• To selectively allow substances to enter and exit the cell

• To store genetic information

• To synthesize proteins

Which type of transport does not require energy from the cell?

• Active transport

• Passive transport

• Facilitated transport

• Osmosis

What is the simplest form of passive transport?

• Facilitated diffusion

• Osmosis

• Simple diffusion

• Active transport

Which of the following is a special name for the facilitated diffusion of water molecules?

• Active transport

• Osmosis

• Simple diffusion

• Sodium-potassium pump

What is required for active transport to occur?

• Concentration gradient

• ATP (adenosine triphosphate)

• Channel proteins

• Equilibrium

In the sodium-potassium pump, how many sodium ions are transported out of the cell?

• One

• Two

• Three

• Four

What role does ATP play in active transport?

• It acts as a channel protein

• It provides energy to change the shape of transport proteins

• It maintains equilibrium

• It diffuses molecules across the membrane

Which of the following is an example of passive transport?

• Sodium-potassium pump

• Facilitated diffusion

• ATP synthesis

• Calcium ion pumping

Why do cells need to use active transport for calcium ions?

• To maintain equilibrium

• To increase calcium concentration inside the cell

• To keep a higher concentration of calcium outside the cell

• To produce ATP

What is the main purpose of the sodium-potassium pump in animal cells?

• To produce energy

• To synthesize proteins

• To maintain concentrations of sodium and potassium for vital functions

• To store calcium ions