Passive and Active Transport Concepts

The video tutorial covers the final part of module 1, focusing on cell transport and homeostasis. It explains passive transport, which requires no energy and moves particles from high to low concentration, and active transport, which requires energy in the form of ATP to move particles from low to high concentration. The tutorial also details diffusion, facilitated diffusion, and the structure of the cell membrane, including phospholipids and membrane proteins.

What is the main characteristic of passive transport?

• Involves the sodium-potassium pump

• Does not require energy

• Moves from low to high concentration

• Requires energy

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

• Sodium-potassium pump

• Diffusion

• Osmosis

• Facilitated diffusion

What is required for active transport to occur?

• Diffusion

• Equilibrium

• ATP

• Osmosis

What is the role of the sodium-potassium pump in active transport?

• To move water across the membrane

• To transport ions against their concentration gradient

• To facilitate diffusion of glucose

• To maintain equilibrium

In which direction do particles move during diffusion?

• Against the concentration gradient

• Using energy

• From low to high concentration

• From high to low concentration

What are the hydrophilic parts of the cell membrane called?

• Fatty acid tails

• Proteins

• Phosphates

• Lipids

Which molecules typically move through the cell membrane via diffusion?

• Large polar molecules

• Ions

• Small nonpolar molecules

• Proteins

What type of molecules move through channel proteins during facilitated diffusion?

• ATP molecules

• Water molecules

• Large polar molecules

• Small nonpolar molecules

How does facilitated diffusion differ from simple diffusion?

• It only occurs in plant cells

• It uses channel proteins

• It moves molecules against the concentration gradient

• It requires energy

Which of the following is a characteristic of facilitated diffusion?

• Requires ATP

• Moves ions through channel proteins

• Occurs only in animal cells

• Involves the sodium-potassium pump