Active Transport: Moving Substances Against Concentration Gradient

The video explains how substances move in and out of cells through diffusion, osmosis, and active transport. Active transport is highlighted as a process that moves substances against a concentration gradient using energy from respiration. Examples include mineral ion uptake in plant root hair cells and sugar absorption in the human gut.

What is the primary difference between diffusion and active transport?

• Diffusion moves substances from high to low concentration, while active transport moves them from low to high concentration.

• Active transport moves substances from high to low concentration, while diffusion does the opposite.

• Diffusion requires energy, while active transport does not.

• Active transport does not involve the cell membrane, while diffusion does.

Which of the following is necessary for active transport to occur?

• A concentration gradient moving from high to low

• A high concentration of water molecules

• A permeable cell wall

• Energy from respiration

In the process of active transport, what role do transporter proteins play?

• They provide energy for the transport process.

• They change shape to move molecules across the cell membrane.

• They create a concentration gradient.

• They act as a barrier to prevent molecule movement.

How do root hair cells in plants utilize active transport?

• By absorbing water from the soil

• By moving mineral ions from a higher concentration in the soil to a lower concentration in the cell

• By absorbing mineral ions from a lower concentration in the soil to a higher concentration in the cell

• By releasing excess minerals into the soil

Why is active transport important in the human gut?

• It helps in the digestion of proteins.

• It prevents sugar molecules from entering the bloodstream.

• It allows sugar molecules to be absorbed into the blood even when their concentration is higher in the blood.

• It helps in the absorption of water molecules.