Mastering Passive Transport Through Diffusion and Osmosis

Dr. Mike Todorovic explains passive transport, focusing on diffusion and osmosis. Diffusion involves solutes moving from high to low concentration, demonstrated with a sugar cube in water. Osmosis, similar but distinct, involves water moving through a semi-permeable membrane to balance solute concentration. Both processes aim for equilibrium without energy use. The video concludes with a preview of active transport, which requires energy to move substances from low to high concentration.

What is passive transport?

• Movement of substances using energy

• Movement of substances without using energy

• Movement of substances against concentration gradient

• Movement of substances with the help of enzymes

Which of the following is an example of diffusion?

• Salt being pumped out of a cell

• Oxygen being used in cellular respiration

• Sugar dissolving evenly in water

• Water moving through a semi-permeable membrane

In the context of diffusion, what is a solute?

• The liquid in which substances dissolve

• The substance that dissolves in a solvent

• A type of cell that absorbs water

• A membrane that allows certain substances to pass

What is the main difference between diffusion and osmosis?

• Diffusion involves solutes, osmosis involves water

• Diffusion requires energy, osmosis does not

• Osmosis involves solutes, diffusion involves water

• Osmosis requires energy, diffusion does not

What role does a semi-permeable membrane play in osmosis?

• It allows all substances to pass through

• It allows only solutes to pass through

• It blocks all substances from passing

• It allows only water to pass through

What is the goal of both diffusion and osmosis?

• To create an unequal distribution of solutes

• To decrease the concentration of solutes

• To create an even distribution of solutes

• To increase the concentration of solutes

Why is passive transport considered 'passive'?

• It requires a lot of energy

• It occurs only in non-living systems

• It does not require energy

• It happens only in plants

What analogy is used to explain passive transport?

• Climbing a mountain

• Sliding down a slide

• Flying a kite

• Swimming upstream

What is active transport?

• Movement from high to low concentration with energy

• Movement from low to high concentration without energy

• Movement from low to high concentration with energy

• Movement from high to low concentration without energy

Why is drinking salt water harmful to cells?

• It hydrates the cells too much

• It has no effect on cells

• It provides too many nutrients

• It causes cells to lose water