Transport Mechanisms: Exploring Diffusion Osmosis and Cellular Movement

The video explains diffusion, osmosis, and transport mechanisms in cells. It covers passive transport, where materials move from high to low concentration without energy, and active transport, which requires energy to move materials against the gradient. Facilitated diffusion involves carrier proteins, while osmosis is the diffusion of water. The video also demonstrates osmosis using a U-tube example, highlighting the movement of water across a semi-permeable membrane.

What is the primary characteristic of passive transport?

• It moves substances from high to low concentration without energy.

• It requires energy to move substances.

• It moves substances from low to high concentration.

• It involves the use of carrier proteins.

Which of the following is an example of passive transport?

• Sodium-potassium pump

• Endocytosis

• Facilitated diffusion

• Exocytosis

What is required for active transport to occur?

• A semi-permeable membrane

• Energy in the form of ATP

• Carrier proteins

• A concentration gradient

Which process involves moving substances against their concentration gradient?

• Facilitated diffusion

• Active transport

• Osmosis

• Simple diffusion

How does facilitated diffusion differ from simple diffusion?

• It requires energy.

• It only occurs in plant cells.

• It involves carrier proteins.

• It moves substances from low to high concentration.

What role do carrier proteins play in facilitated diffusion?

• They block the passage of water.

• They assist in moving substances across the membrane.

• They create a concentration gradient.

• They provide energy for transport.

What is osmosis specifically concerned with?

• The movement of water

• The movement of gases

• The movement of proteins

• The movement of ions

In osmosis, water moves from an area of _____ to an area of _____.

• low solute concentration; high solute concentration

• high solute concentration; low solute concentration

• low water concentration; high water concentration

• high water concentration; low water concentration

In the U-tube experiment, what causes the water level to change?

• The movement of water to balance solute concentration

• The movement of solute to balance water concentration

• The removal of solute

• The addition of more solute

What is the driving force behind osmosis in the U-tube experiment?

• Electrical charge

• Temperature

• Gravity

• Osmotic pressure