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Cell Membrane and Diffusion

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Questions and Answers

What is the primary source of energy for diffusion?

Cellular respiration

The kinetic energy of random movement of molecules and ions (correct)

Active transport

Concentration gradient

What is the net direction of particle movement in diffusion?

From a region of higher concentration to a region of lower concentration (correct)

Random movement in all directions

No net movement

From a region of lower concentration to a region of higher concentration

What is the role of water in osmosis?

To facilitate the movement of ions across the cell membrane

As a solvent to aid in digestion, excretion, and transport (correct)

To regulate the temperature of the cell

To aid in the transport of glucose and oxygen

What is the primary factor that influences the rate of diffusion?

Concentration gradient Signup and view all the answers

What is the term for the movement of water molecules from a region of higher water potential to a region of lower water potential?

Osmosis Signup and view all the answers

What happens to a cell in an animal when the solute concentration inside the cell increases?

The cell bursts due to an influx of water. Signup and view all the answers

What is the purpose of carrier proteins in active transport?

To pick up specific molecules and transport them against their concentration gradient. Signup and view all the answers

What is the main difference between the effects of solute concentration on plant cells versus animal cells?

Plant cells become turgid when the solute concentration inside the cell increases, while animal cells burst. Signup and view all the answers

What is the function of dialysis tubing in the dialysis tubing experiment?

To act as a selectively permeable membrane. Signup and view all the answers

Why is active transport necessary in certain organisms?

To optimize the uptake of nutrients against their concentration gradient. Signup and view all the answers