Cell Membrane Dynamics and Facilitated Diffusion Explained

The video explains passive transport, focusing on facilitated diffusion. It describes the cell membrane's lipid bilayer structure and how chloride ions move across it without energy. The process involves proteins embedded in the membrane, specifically chloride channels, which change conformation to transport ions. This method allows ions to enter cells efficiently without ATP.

What is the primary structure of the cell membrane?

• Carbohydrate layer

• Nucleic acid layer

• Lipid bilayer

• Protein monolayer

Which part of the lipid bilayer is hydrophobic?

• Neither head nor tail

• Both head and tail

• The tail

• The head

How do chloride ions move from outside to inside the cell?

• Active transport

• Osmosis

• Facilitated diffusion

• Simple diffusion

What is the main focus of facilitated diffusion?

• Facilitating movement with proteins

• Using energy to move particles

• Creating a concentration gradient

• Blocking particle movement

What role do proteins play in facilitated diffusion?

• They dissolve ions

• They block ion movement

• They act as channels for specific ions

• They provide energy for transport

What is unique about the chloride channel's structure?

• It is a flexible membrane

• It is a solid barrier

• It has a specific pocket for chloride ions

• It is a simple tube

What happens to the chloride channel when it binds a chloride ion?

• It remains unchanged

• It becomes more rigid

• It dissolves

• It changes shape

What triggers the protein to change its conformation?

• Binding of ATP

• Binding of a chloride ion

• Temperature change

• pH change

What is the result of the protein's conformational change?

• Chloride ion is trapped

• Chloride ion is released inside the cell

• Protein is destroyed

• Protein becomes inactive

Does the process of facilitated diffusion require ATP?

• Only sometimes

• Depends on the ion

• No, never

• Yes, always