Simple Diffusion and Membrane Transport

The video tutorial explains membrane transport, focusing on simple diffusion. It begins with an overview of membrane structure and transport methods, then delves into simple diffusion, using analogies and examples like oxygen and carbon dioxide transport. The video highlights the requirements for simple diffusion, such as small, hydrophobic molecules, and concludes with a summary of its characteristics.

What is the primary function of the cell membrane?

• To store genetic information

• To control what enters and exits the cell

• To provide energy to the cell

• To produce proteins

Which of the following is NOT a method of membrane transport?

• Simple diffusion

• Photosynthesis

• Active transport

• Facilitated diffusion

What is a key difference between simple diffusion and facilitated diffusion?

• Simple diffusion occurs against the concentration gradient

• Facilitated diffusion uses protein channels

• Simple diffusion requires energy

• Facilitated diffusion is slower

In the analogy of simple diffusion, what happens when the door is left open on a hot day?

• The house becomes cooler

• The heat diffuses into the house

• The house remains the same temperature

• The heat diffuses out of the house

What drives the movement of oxygen into cells during simple diffusion?

• Energy from ATP

• Presence of protein channels

• A concentration gradient

• Active transport mechanisms

Why is carbon dioxide able to leave the cell through simple diffusion?

• It is actively transported out

• It is a large molecule

• It moves down its concentration gradient

• It requires a protein channel

What is the role of a concentration gradient in simple diffusion?

• It provides energy for the process

• It requires ATP to function

• It acts as a barrier to diffusion

• It drives the movement of molecules

Which of the following is a byproduct of cellular respiration that exits the cell through simple diffusion?

• Glucose

• Oxygen

• Water

• Carbon dioxide

Which characteristic is NOT required for a molecule to undergo simple diffusion?

• Being hydrophobic

• Having no charge

• Being small in size

• Being polar

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

• Charged ions

• Large proteins

• Hydrophilic molecules

• Small, non-polar molecules