BIOLOGY - Cells - Active Transport

The video tutorial explains the differences between diffusion, osmosis, and active transport. Diffusion and osmosis are passive processes where substances move from high to low concentration without energy. Active transport, however, requires energy to move substances against the concentration gradient from low to high concentration. This process is facilitated by protein carriers in the cell membrane, using energy from respiration. Active transport is crucial for absorbing nutrients in root hair cells and retaining essential substances in kidneys. Cells performing active transport often have many mitochondria to supply the necessary energy.

What is the primary difference between diffusion and osmosis?

• Diffusion involves water, osmosis involves gases.

• Diffusion requires energy, osmosis does not.

• Diffusion moves substances from low to high concentration, osmosis does the opposite.

• Diffusion is the movement of gases, osmosis is the movement of water.

What is a key characteristic of active transport?

• It is the same as diffusion.

• It moves substances against the concentration gradient.

• It does not require energy.

• It moves substances from high to low concentration.

Which cellular component is primarily responsible for active transport?

• Chloroplasts

• Nucleus

• Protein carriers

• Cell wall

Why do cells involved in active transport have many mitochondria?

• To absorb sunlight

• To produce proteins

• To provide energy for active transport

• To store waste products

How does active transport differ from diffusion in terms of energy usage?

• Active transport requires energy, diffusion does not.

• Both require energy.

• Diffusion requires energy, active transport does not.

• Neither requires energy.