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, including diffusion, osmosis, and facilitated diffusion. Active transport, which requires ATP to move particles from low to high concentration, is also discussed, with the sodium-potassium pump as a key example. The structure of the cell membrane, including phospholipids and membrane proteins, is detailed, highlighting how different molecules move across it.

What is the main characteristic of passive transport?

• It requires energy in the form of ATP.

• It moves substances from low to high concentration.

• It does not require energy.

• It involves the sodium-potassium pump.

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

• Diffusion

• Osmosis

• Facilitated diffusion

• Sodium-potassium pump

What is required for active transport to occur?

• A concentration gradient

• Energy in the form of ATP

• Equal concentrations on both sides

• No energy

Which process is an example of active transport?

• Facilitated diffusion

• Osmosis

• Sodium-potassium pump

• Diffusion

What is the role of phospholipids in the cell membrane?

• They provide energy for transport.

• They transport ions across the membrane.

• They form the basic structure of the membrane.

• They act as channel proteins.

What type of molecules can pass through the cell membrane via diffusion?

• Small nonpolar molecules

• Ions

• Proteins

• Large polar molecules

How do facilitated diffusion and simple diffusion differ?

• Simple diffusion requires channel proteins.

• Facilitated diffusion requires energy.

• Facilitated diffusion uses channel proteins.

• Simple diffusion moves substances from low to high concentration.

Which of the following is a characteristic of facilitated diffusion?

• It uses channel proteins to move substances.

• It only moves water molecules.

• It moves substances against their concentration gradient.

• It requires ATP.

What type of molecules are typically moved by facilitated diffusion?

• Small nonpolar molecules

• Large polar molecules

• Water molecules

• ATP molecules

In facilitated diffusion, what role do channel proteins play?

• They provide energy for transport.

• They act as a barrier to ions.

• They assist in moving large polar molecules across the membrane.

• They break down ATP.