Cell Membrane Transport Mechanisms

The video tutorial explains the movement of molecules across the cell membrane, focusing on active and passive transport. It highlights the sodium-potassium pump as an example of active transport requiring energy, while glucose transport is passive. The tutorial guides students through analyzing a question about these processes, clarifying concepts like osmosis and facilitated diffusion, and deducing the correct answer based on the information provided.

What type of transport is the sodium-potassium pump an example of?

• Facilitated diffusion

• Active transport

• Passive transport

• Osmosis

Which of the following does not require energy to move across the cell membrane?

• Potassium ions

• Sodium ions

• Glucose

• Calcium ions

What is the main characteristic of facilitated diffusion?

• Requires energy

• Moves against concentration gradient

• Assisted movement without energy

• Involves water movement

Which statement is true about osmosis?

• It moves glucose across the membrane

• It requires energy

• It involves the movement of water

• It is a type of active transport

Which transport mechanism is used by glucose to cross the cell membrane?

• Simple diffusion

• Active transport

• Facilitated diffusion

• Osmosis

What is the role of the sodium-potassium pump in cells?

• To facilitate passive transport

• To maintain ion balance using energy

• To transport water across the membrane

• To move glucose into the cell

Why can glucose not move by osmosis?

• Because it requires energy

• Because it is an ion

• Because it moves against the concentration gradient

• Because it is not a water molecule

Which of the following is a characteristic of active transport?

• Requires energy to move substances

• Does not require energy

• Moves substances down their concentration gradient

• Involves the movement of water

What distinguishes facilitated diffusion from simple diffusion?

• Facilitated diffusion moves substances against their gradient

• Facilitated diffusion is a form of active transport

• Facilitated diffusion involves transport proteins

• Facilitated diffusion requires energy

Which statement correctly describes the movement of sodium and potassium ions?

• They move by facilitated diffusion

• They move by simple diffusion

• They are moved by active transport

• They move by osmosis