Exploring Diffusion and Osmosis in Cells

The video tutorial provides a detailed explanation of diffusion and osmosis. It begins with a recap of diffusion, describing it as the movement of molecules from high to low concentration until equilibrium is reached. Examples such as body spray and food coloring in water are used to illustrate this concept. The tutorial then transitions to osmosis, explaining it as the diffusion of water across a selectively permeable membrane. The role of aquaporins in facilitated diffusion is discussed, highlighting passive transport. The video also covers the inverse relationship between solute and solvent concentrations, using terms like hypertonic and hypotonic to describe solutions. The tutorial concludes with a recap of key concepts.

What is the primary driving force behind diffusion?

• Movement from low to high concentration

• Movement from high to low concentration

• Movement from equilibrium to disequilibrium

• Movement from low to lower concentration

In the example of body spray, where is the concentration of particles highest?

• Inside the circle

• In the center of the room

• Near the door

• Near the windows

What is osmosis specifically the diffusion of?

• Solutes

• Gases

• Water

• Proteins

What type of membrane does osmosis occur across?

• Impermeable membrane

• Selectively permeable membrane

• Permeable membrane

• Non-permeable membrane

What happens to the concentration of free water when there is a high concentration of sodium molecules?

• It increases

• It decreases

• It remains the same

• It fluctuates

What is the role of aquaporins in osmosis?

• They block water movement

• They facilitate water movement

• They transport solutes

• They use energy to move water

What type of diffusion involves the help of proteins like aquaporins?

• Simple diffusion

• Active transport

• Facilitated diffusion

• Bulk transport

What is the term for a solution with a high concentration of solutes and low concentration of solvents?

• Isotonic

• Hypotonic

• Equitonic

• Hypertonic

What is the net movement of water molecules in a hypertonic solution?

• Both into and out of the cell equally

• No movement

• Into the cell

• Out of the cell

What is the relationship between solute concentration and solvent concentration in a solution?

• Random relationship

• No relationship

• Inverse relationship

• Direct relationship