Cell Transport Mechanisms Quiz

What is the main difference between passive and active transport in cells?

• Passive transport requires energy, while active transport does not.

• Both require energy but in different forms.

• Active transport requires energy, while passive transport does not.

• Neither requires energy.

Which molecule is commonly involved in active transport due to its inability to freely cross the cell membrane?

• Water

• Oxygen

• Ions

• Lipids

What role does ATP play in active transport?

• It acts as a receptor for ions.

• It provides energy by transferring a phosphate group.

• It acts as a channel for molecules.

• It binds directly to the transported molecule.

In co-transport, what is the energy source for moving a substance against its gradient?

• Heat energy

• Movement of another substance down its gradient

• Direct ATP hydrolysis

• Sunlight

What is membrane potential?

• The potential energy stored in the cell nucleus

• The voltage difference across a cell membrane

• The concentration of water inside the cell

• The temperature difference across the cell membrane

What two forces drive the diffusion of ions across the membrane?

• Magnetic and electrical forces

• Chemical and thermal forces

• Electrical and gravitational forces

• Chemical and electrical forces

What is the primary function of the sodium-potassium pump?

• To generate ATP

• To maintain the ideal concentration of sodium and potassium ions

• To transport glucose into the cell

• To synthesize proteins

How many sodium ions are transported out of the cell in one cycle of the sodium-potassium pump?

• Three

• Two

• One

• Four

What triggers the sodium-potassium pump to change its shape?

• Temperature change

• ATP hydrolysis

• Light exposure

• Binding of glucose

What is the net charge transfer in one cycle of the sodium-potassium pump?

• One positive charge to the extracellular fluid

• One positive charge to the cytoplasm

• Two positive charges to the cytoplasm

• Two positive charges to the extracellular fluid