Cell Transport Mechanisms: Energy Use and Substance Movement

The video tutorial explains cell transport mechanisms, distinguishing between passive and active transport. Passive transport, which requires no energy, includes simple diffusion, osmosis, and facilitated diffusion, all moving substances from high to low concentration. Active transport, requiring energy, involves primary and secondary transport using ATP and concentration gradients. Vesicle transport, including exocytosis and endocytosis, is also covered, with specific types like phagocytosis and pinocytosis explained.

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

• Both require energy but in different forms.

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

• Neither requires energy.

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

Which of the following is NOT a type of passive transport?

• Simple diffusion

• Osmosis

• Facilitated diffusion

• Exocytosis

In facilitated diffusion, what assists the movement of substances across the cell membrane?

• Vesicles

• Transport proteins

• Concentration gradients

• ATP

What is the primary energy source for primary active transport?

• ATP

• Glucose

• Oxygen

• Concentration gradients

Which type of endocytosis is described as 'cellular eating'?

• Exocytosis

• Receptor-mediated endocytosis

• Phagocytosis

• Pinocytosis

What is the role of clathrin in receptor-mediated endocytosis?

• It breaks down substances inside the cell.

• It transports water across the membrane.

• It forms coated vesicles from the plasma membrane.

• It provides energy for the process.