Movement of substances into and out of Cells

Question 1

What is diffusion?

Answer 1

The net movement of molecules from an area of high concentration to an area of low concentration down the concentration gradient.

Question 2

Why does the rate of diffusion increase when temperature increases?

Answer 2

As the temperature increases, particles gain more kinetic energy. This increases the chance of collisions between molecules being successful and leading to a reaction.

Question 3

What is active transport?

Answer 3

Active transport is the movement of molecules from a low concentration to a high concentration against the concentration gradient using ATP.

Question 4

In the osmosis and potato practical, why is it important to dry the potato cylinders before weighing?

Answer 4

The potato cylinders were blotted with paper towels before weighing to remove any surface water that could affect the mass measurement.

Question 5

What is the effect of decreasing diffusion distance on the rate of diffusion?

Answer 5

As diffusion distance decreases, the rate of diffusion increases.